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S
scot(o)- - Seessel's pouch (pocket)

scot(o)- (scot(o)-) [Gr. skotos darkness]  a combining form denoting relationship to darkness.

Scotobacteria (Sco·to·bac·te·ria) (sko”to-bak-tēr´e-ə) [scoto- + bacteria]  a class of bacteria of the division Gracilicutes, kingdom Procaryotae, made up of gram-negative organisms that do not derive energy from light (nonphototrophic metabolism). It contains aerobic and anaerobic rods and cocci, including the medically important families Spirochaetaceae, Spirosomaceae, Pseudomonadaceae, Enterobacteriaceae, Vibrionaceae, Bacteroidaceae, Neisseriaceae, Legionellaceae, Pasteurellaceae, and Veillonellaceae and the orders Rickettsiales and Chlamydiales.

scotobacterium (sco·to·bac·te·ri·um) (sko”to-bak-tēr´e-əm)  1. an individual organism of the class Scotobacteria.  2. a bacterium capable of growing in the dark.

scotochromogen (sco·to·chro·mo·gen) (sko”to-kro´mo-jən) [scoto- + chromo- + -gen]  a microorganism whose pigmentation develops in the dark as well as in the light; specifically, a member of Runyon Group II of the nontuberculous mycobacteria, but applicable also to many other organisms. See also nontuberculous mycobacteria, under mycobacterium.

scotochromogenic (sco·to·chro·mo·gen·ic) (sko”to-kro”mo-jen´ik)  pertaining to or characterized by scotochromogenicity.

scotochromogenicity (sco·to·chro·mo·ge·nic·i·ty) (sko”to-kro”mo-jə-nis´ĭ-te)  the property of forming pigment in the dark, the coloration occurring irrespective of exposure to light.

scotodinia (sco·to·din·ia) (sko”to-din´e-ə) [scoto- + Gr. dinos whirl]  dizziness with blurring of vision and headache. Called also apoplectic vertigo and tenebric vertigo.

scotoma (sco·to·ma) (sko-to´mə)  pl. scoto´mata [Gr. skotōma]  1. an area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision.  2. mental s.

absolute s.  an area within the visual field in which perception of light is entirely lost.

annular s.  a circular area of depressed vision in the visual field, surrounding the point of fixation.

arcuate s.  a scotoma arising at or near the blind spot and arching inferiorly or superiorly toward the nasal field, following the paths of the retinal nerve fibers.

aural s. ,  s. au´ris  loss of ability to perceive auditory stimuli coming from a certain direction.

Bjerrum's s.  a further development of Seidel's scotoma, the sickle-shaped defect contiguous to the blind spot extending above and below the fixation point and encircling it more or less completely.

cecocentral s.  centrocecal s.

central s.  an area of depressed vision corresponding with the point of fixation and interfering with or entirely abolishing central vision.

centrocecal s.  a horizontal oval defect in the field of vision situated between and embracing both the point of fixation and the blind spot.

color s.  an isolated area of depressed or defective vision for color in the visual field.

flittering s.  teichopsia.

hemianopic s.  depressed or lost vision affecting half of the central visual field. Cf. hemianopia.

mental s.  in psychiatry, a figurative blind spot in a person's psychological awareness, the patient being unable to gain insight into and to understand his mental problems; lack of insight.

motile s.’s  floating opacities, not true scotomata, occurring in the vitreous, muscae volitantes being an example of such a defect.

negative s.  a scotoma appearing as a blank spot in the visual field; the patient is unaware of it, and it is detected only by examination.

paracentral s.  an area of depressed vision situated near the point of fixation.

peripapillary s.  an area of depressed vision in the visual field near that corresponding with the optic disk.

peripheral s.  an area of depressed vision distant from the point of fixation, toward the periphery of the visual field.

physiologic s.  that area of the visual field corresponding with the optic disk, in which the photosensitive receptors are absent.

positive s.  a scotoma subjectively perceived as a black spot in the visual field, and of which the patient is aware.

relative s.  an area of the visual field in which perception of light is only diminished, or the loss is restricted to light of certain wavelengths.

ring s.  annular s.

scintillating s.  teichopsia.

Seidel's s.  a further development of an arcuate scotoma, which extends at either or both ends, the concavity of the prolongation always being directed toward the fixation point.

scotomagraph (sco·to·ma·graph) (sko-to´mə-graf) [scotoma + -graph]  an instrument for recording a scotoma.

scotomata (sco·to·ma·ta) (sko-to´mə-tə)  plural of scotoma.

scotomatous (sco·tom·a·tous) (sko-tom´ə-təs)  pertaining to or affected with scotoma.

scotometer (sco·tom·e·ter) (sko-tom´ə-tər) [scotoma + -meter]  an instrument for diagnosing and measuring scotomata.

Bjerrum's s.  campimeter.

scotometry (sco·tom·e·try) (sko-tom´ə-tre)  the measurement of isolated areas of depressed vision (scotomata) within the visual field.

scotophilia (sco·to·phil·ia) (sko”to-fil´e-ə) [scoto- + -philia]  nyctophilia.

scotophobia (sco·to·pho·bia) (sko”to-fo´be-ə) [scoto- + -phobia]  irrational fear of darkness.

scotopia (sco·to·pia) (sko-to´pe-ə) [scot- + -opia]  night vision; see also dark adaptation, under adaptation.

scotopic (sco·top·ic) (sko-top´ik)  pertaining to scotopia.

scotopsin (sco·top·sin) (sko-top´sin)  the opsin of the rods of the retina that combines with 11-cis retinal to form rhodopsin. See illustration at visual cycle, under cycle.

scotoscopy (sco·tos·co·py) (sko-tos´kə-pe) [scoto- + scopy]  retinoscopy.

scours (scours) (skourz)  diarrhea in animals other than humans.

black s.  acute dysentery in cattle, accompanied by intestinal hemorrhage producing a dark color of the feces; the etiology is unknown. See also bloody s. and winter dysentery.

bloody s.  swine dysentery.

calf s.  see under diarrhea.

peat s.  molybdenum poisoning in grazing cattle.

weanling pig s.  1. postweaning diarrhea.  2. coliform gastroenteritis.

white s.  neonatal diarrhea in calves, lambs, and foals during the first few days after birth, usually caused by enteropathogenic strains of Escherichia coli and less often by other bacteria or viruses; marked by fever, dehydration, and depression, with fetid light-colored feces that may be bloodstained late in the disease.

winter s.  see under dysentery.

scr (scr)  scruple.

scrapie (scra·pie) (skra´pe)  the first of the prion diseases to be recognized, occurring in sheep and goats and characterized by severe pruritus, muscular incoordination, and increasing debility, ending in death.

scratch (scratch) (skrach)  1. to scrape or rub a surface lightly with the nails or with a sharp or jagged instrument, particularly to relieve itching.  2. a slight wound.  3. to make shallow cuts on a surface.  4. to make a thin grating sound.

Means-Lerman s.  a systolic grating sound heard in the second left intercostal space during exhalation in hypertension, caused by friction between the pleural and pericardial surfaces.

scratches (scratch·es) (skrach´əz)  greasy heel.

screen (screen) (skrēn)  1. a structure resembling a curtain or partition, used as a protection or shield, e.g., against excessive radiation exposure; see also shield.  2. a large flat surface upon which light rays are projected.  3. an agent that affords defense against a deleterious influence; called also protectant and protective.  4. to examine by fluoroscopy (Great Britain).  5. to separate well individuals in a population from those who have an undiagnosed disease, defect, or other pathologic condition or who are at high risk, by means of tests, examinations, or other procedures. See also screening.

Bjerrum s.  tangent s.

fluorescent s.  a sheet of cardboard, paper, or glass coated with suitable material, which fluoresces visibly, as calcium tungstate, used as an intensifying screen in radiography; as the chief part of a fluoroscope; as a substitute for a fluoroscope in a darkened room.

intensifying s.  a thin sheet of celluloid or other substance coated with a finely divided substance which fluoresces under the influence of x-rays and intended to be used in close contact with the emulsion of a photographic plate or film for the purpose of reinforcing the image.

oral s.  vestibular s.

skin s.  a substance applied to the skin to protect it from the effects of the sun's rays or other noxious agents.

solar s. ,  sun s.  sunscreen.

tangent s.  a large square of black cloth, stretched on a frame, hung from a roller, and having a central mark for fixation; used with a campimeter to map the field of vision. Called also Bjerrum s.

vestibular s.  an acrylic resin removable orthodontic appliance that covers the labial or buccal surface of one or both dental arches, fitting between the oral mucosa and the teeth; used to treat oral habits and to stimulate tooth movement. Called also oral s. and oral shield.

screening (screen·ing) (skrēn´ing)  1. examination or testing of a group of individuals to separate those who are well from those who have an undiagnosed disease or defect or who are at high risk.  2. fluoroscopy (Great Britain).

antibody s.  a method of determining the presence and amount of anti-HLA antibodies in the serum of a potential allograft recipient: aliquots of the recipient's serum are mixed with a panel of leukocytes from well-characterized cell donors and complement is added. Reaction between the recipient's pre-existing antibody and specific antigen in the donor cells leads to cell lysis; the percentage of different cells lysed provides a rough measure of the sensitization of the recipient (referred to as the panel reactive antibody).

mass s.  that performed on or made available to an entire population.

multiphasic s. ,  multiple s.  that in which various diagnostic procedures are employed during the same screening program.

prescriptive s.  that performed for the early detection of disease or disease precursors in apparently well individuals so that health care can be provided early in the course of the disease or before the disease becomes manifest.

screw (screw) (skroo)  a solid cylinder with a helical thread on its exterior surface, used to hold two objects together.

pedicle s.  a screw that goes into the pedicle of a vertebral arch, often in the lumbar region, used in various types of instrumentation.

screwworm (screw·worm) (skroo´wərm)  the larva of Cochliomyia hominivorax.

Scribner shunt (Scrib·ner shunt) (skrib´nər) [Belding H. Scribner, American nephrologist, born 1921]  Quinton-Scribner shunt.

scrobiculate (scro·bic·u·late) (skro-bik´u-lāt) [L. scrobiculatus]  marked with pits or cavities.

scrobiculus (scro·bic·u·lus) (scro-bik´u-ləs) [L. “little trench,” “pit”]  fossula.

s. cor´dis  fossa epigastrica.

scrofula (scrof·u·la) (skrof´u-lə) [L. “brood sow”]  former name for tuberculous cervical lymphadenitis. See also scrofuloderma.

scrofuloderma (scrof·u·lo·der·ma) (skrof”u-lo-dər´mə) [scrofula + derma]  a tuberculous or nontuberculous mycobacterial infection affecting children and young adults, representing direct extension of tuberculosis into the skin from underlying structures such as lymph nodes (especially the cervical), bone or lung or by contact exposure to tuberculosis. It is manifested by the development of painless subcutaneous swellings that evolve into cold abscesses, multiple ulcers, and draining sinus tracts. Called also tuberculosis colliquativa and tuberculosis colliquativa cutis. Cf. tuberculous gumma.

scrotal (scro·tal) (skro´təl)  pertaining to the scrotum.

scrotectomy (scro·tec·to·my) (skro-tek´tə-me) [scrotum + -ectomy]  partial or complete excision of the scrotum.

scrotitis (scro·ti·tis) (skro-ti´tis)  inflammation of the scrotum.

scrotocele (scro·to·cele) (skro´to-sēl) [scrotum + -cele¹]  scrotal hernia.

scrotoplasty (scro·to·plasty) (skro´to-plas”te) [scrotum + -plasty]  plastic surgery of the scrotum.

scrotum (scro·tum) (skro´təm) [L. “bag”]   [TA] the pouch that contains the testes and their accessory organs. It is composed of skin, the tunica dartos, the spermatic, cremasteric, and infundibuliform fasciae, and the tunica vaginalis testis.

bifid s.  separation of the two halves of the scrotum, as in penoscrotal transposition.

lymph s.  elephantiasis scroti.

watering-can s.  a condition in which the undersurface of the scrotum and the perineum have multiple sinuses discharging urine, owing to neglected stricture of the nearby urethra.

scruple (scru·ple) (, scr) (skroo´pəl) [L. scrupulus, dim. of scrupus a sharp stone, a worry or anxiety]  a unit of mass (weight) of the apothecaries' system, being 20 grains, or the equivalent of 1.296 g.

scrupulosity (scru·pu·los·i·ty) (skroo”pu-los´ĭ-te)  excessive meticulousness or punctiliousness, usually related to moral or religious questions.

Scultetus bandage (Scul·te·tus bandage) (skəl-te´təs) [Johannes Schultes (L. Scultetus), German surgeon, 1595–1645]  see under bandage.

scultetus (scul·te·tus) (skəl-te´təs) [J. Schultes (Scultetus)]  Scultetus bandage.

scu-PA (scu-PA)  single-chain urokinase-type plasminogen activator; see prourokinase.

scurvy (scur·vy) (skur´ve) [L. scorbutus]  a condition due to deficiency of ascorbic acid (vitamin C) in the diet and marked by weakness, anemia, spongy gums, a tendency to mucocutaneous hemorrhages and a brawny induration of the muscles of the lower limbs.

hemorrhagic s.  infantile s.

infantile s.  a nutritional disease of infants characterized by the same symptoms as scurvy in adults; called also Barlow disease.

scute (scute) (skūt) [L. scutum shield]  1. any squama or scalelike structure.  2. tympanic s.

tympanic s.  the bony plate which divides the upper part of the tympanic cavity from the mastoid cells.

scutellum (scu·tel·lum) (sku-tel´əm)  pl. scutel´la [L. "little shield," dim. of scutum shield]  the third of the four chitinous plates making up the dorsum of the thorax of an insect.

scutiform (scu·ti·form) (sku´tĭ-form) [scutum + form]  shaped like a shield; called also thyroid.

scutula (scu·tu·la) (sku´tu-lə)  plural of scutulum.

scutular (scu·tu·lar) (sku´tu-lər)  pertaining to or containing scutula.

scutulum (scu·tu·lum) (sku´tu-ləm)  pl. scu´tula [L. “little shield”]  a yellow, perifollicular, saucerlike or cup-shaped crust with a cheesy odor, composed of dense mats of mycelia and epithelial debris, characteristic of favus.

scutum (scu·tum) (sku´təm) [L. “shield”]  1. tympanic scute.  2. cartilago thyroidea.  3. a hard chitinous plate on the anterior portion of the dorsal surface of hard-bodied ticks.

s. pec´toris  sternum.

scybala (scyb·a·la) (sib´ə-lə) [Gr.]  plural of scybalum.

scybalous (scyb·a·lous) (sib´ə-ləs)  of the nature of or composed of scybala.

scybalum (scy·ba·lum) (sib´ə-ləm)  pl. scy´bala [Gr. skybalon]  a dry, hard mass of fecal matter in the intestine.

scyphoid (scy·phoid) (si´foid) [Gr. skyphos cup + -oid]  shaped like a cup.

Scytalidium (Scy·ta·lid·ium) (si”tə-lid´e-əm)  a genus of Fungi Imperfecti of the form-class Coelomycetes, usually found in soil or wood. S. hyali´num is a synanamorph of Hendersonula toruloides and has been isolated from cases of phaeohyphomycosis.

scythropasmus (scy·thro·pas·mus) (si”thro-paz´məs) [Gr. skythrōpasmos, from skythrōpazein to look sullen]  a dull, fatigued expression, regarded as a grave symptom in serious disease.

scytoblastema (scy·to·blas·te·ma) (si”to-blas-te´mə) [Gr. skytos skin + blastema]  the rudimentary skin of the embryo.

SD (SD)  skin dose; standard deviation.

SDA (SDA) [L.]  sacro-dextra anterior (right sacroanterior, a position of the fetus; see position).

SDE (SDE)  specific dynamic effect; see obligatory thermogenesis.

SDP (SDP) [L.]  sacro-dextra posterior (right sacroposterior, a position of the fetus; see position).

SDS (SDS)  sodium dodecyl sulfate.

SDS-PAGE (SDS-PAGE)  SDS–polyacrylamide gel electrophoresis.

SDT (SDT) [L.]  sacro-dextra transversa (right sacrotransverse, a position of the fetus; see position).

SE (SE)  standard error; sphenoethmoidal suture (def. 2).

Se (Se)  selenium.

Seabright bantam syndrome (Sea·bright ban·tam syndrome) (se´brīt ban´təm) [from Seabright bantam chickens, a breed in which the rooster has this condition]  pseudohypoparathyroidism.

seal (seal) (sēl)  1. something that effects a firm closure.  2. to secure or close tightly.  3. in dentistry, a material, usually plastic, that hardens in the mouth; used to close the coronal opening in a tooth during endodontic treatment. See also sealant. 3. a die with a raised emblem used to mark something.

border s.  the contact of the denture border with the underlying or adjacent tissues to prevent the passage of air or other substances.

double s.  a seal consisting of gutta-percha underneath another material (e.g., temporary cement); used to close the coronal opening in a tooth during endodontic treatment.

posterior palatal s.  the seal at the posterior border of a denture produced by displacing some of the soft tissue covering the palate by extra pressure developed in the impression or by scraping a depression in the cast.

Solomon's s.  Polygonatum biflorum.

velopharyngeal s.  see under closure.

sealant (seal·ant) (se´lənt)  an agent that protects against access from the outside or leakage from the inside; sealer.

dental s.  a coating material capable of mechanically bonding to the surface of a tooth and offering protection against decay-causing external chemical or physical agents.

fissure s.  see pit and fissure s.

pit and fissure s.  a dental sealant used to occlude noncarious pits and fissures on occlusal tooth surfaces, thereby preventing caries-producing microorganisms and debris from entering.

sealer (seal·er) (se´lər)  an agent that protects against access from the outside or leakage from the inside; sealant.

endodontic s.  root canal s.

root canal s.  in root canal therapy, a substance used for cementing silver and gutta-percha cones to the tooth structure. Called also endodontic s. and root canal cement.

seam (seam) (sēm)  a line of union.

osteoid s.  on the surface of a bone, the narrow region of newly formed organic matrix not yet mineralized.

pigment s.  the portion of the pigmented epithelium of the iris which bends forward around the pupillary border.

searcher (search·er) (sərch´ər)  a type of sound used to search for calculi in the bladder. Called also stone-searcher.

seat (seat) (sēt)  a part on which the base of something rests or sits.

basal s.  oral tissues which support a complete or partial denture.

rest s.  see under area.

seatworm (seat·worm) (sēt´wərm)  oxyurid.

sea urchin (sea ur·chin) (se ər´chin)  any of various marine animals of the class Echinoidea, having round bodies enclosed in a shell with spiny processes and pedicellariae protruding from it. Genera such as Diadema and Echinothrix may secrete venom from glands on the pedicellariae.

seaweed (sea·weed) (se´wēd)  a plant growing in the sea, especially one of the algae.

sebaceous (se·ba·ceous) (sə-ba´shəs) [L. sebaceus]  1. pertaining to sebum.  2. secreting sebum; see also under gland.

sebiferous (se·bif·er·ous) (sə-bif´ər-əs) [L. sebiferus, from sebum suet + ferre to bear]  sebiparous.

Sebileau's hollow, muscle (Seb·i·leau's hollow, muscle) (seb”ĭ-lōz´) [Pierre Sebileau, French surgeon, 1860–1953]  see under hollow and muscle.

sebiparous (se·bip·a·rous) (sə-bip´ə-rəs) [L. sebum suet + parere to produce]  producing a fatty secretion.

sebolith (sebo·lith) (seb´o-lith) [sebum + -lith]  a concretion formed in a sebaceous gland.

seborrhea (seb·or·rhea) (seb”o-re´ə) [sebum + -rrhea]  1. excessive secretion of sebum; called also hypersteatosis.  2. seborrheic dermatitis.

s. adipo´sa  that in which the secretion is oily, especially occurring about the nose and forehead; called also s. oleosa.

s. oleo´sa  s. adiposa.

s. sic´ca  dry, scaly seborrheic dermatitis.

seborrheal (seb·or·rhe·al) (seb”o-re´əl)  characterized by or pertaining to seborrhea.

seborrheic (seb·or·rhe·ic) (seb”o-re´ik)  1. affected with or of the nature of seborrhea.  2. pertaining to those areas of the body in which sebaceous glands are abundant; i.e., the scalp, face, chest, back, axilla, and groin.

seborrhiasis (seb·or·rhi·a·sis) (seb”o-ri´ə-sis)  inverse psoriasis.

sebotropic (sebo·trop·ic) (seb”o-trop´ik)  having an affinity for or a stimulating effect on sebaceous glands; promoting the excretion of sebum.

sebum (se·bum) (se´bəm) [L. “suet”]  the secretion of the sebaceous glands; a thick, semifluid substance composed of fat and epithelial debris from the cells of the malpighian layer.

cutaneous s. ,  s. cuta´neum  the fatty secretion of the sebaceous glands.

s. palpebra´le  the secretion of the tarsal glands; called also lema.

Secale (Se·ca·le) (se-ka´le) [L. “rye”]  a genus of plants of the grass family (Gramineae). S. cerea´le L. is rye.

Seckel's bird-headed dwarf, syndrome (dwarfism) (Sec·kel's bird-headed dwarf, syndrome (dwarfism)) (sek´əlz) [Helmut Paul George Seckel, American physician, 1900–1960]  see bird-headed dwarf, under dwarf, and see under syndrome.

secobarbital (se·co·bar·bi·tal) (se”ko-bahr´bĭ-təl)   [USP] a short-acting barbiturate with hypnotic and sedative effects. Called also quinalbarbitone.

s. sodium  [USP]  the monosodium salt of secobarbital, having the same actions as the base; administered orally, intravenously, or intramuscularly as a sedative and hypnotic, particularly a presurgical adjunct to anesthesia, and intravenously or intramuscularly as an anticonvulsant in the treatment of tetanus.

secodont (se·co·dont) (se´ko-dont) [L. secare to cut + Gr. odous tooth]  having teeth in which the tubercles of the molars are provided with cutting edges, as in many carnivorous mammals.

Seconal (Sec·o·nal) (sek´o-nahl)  trademark for preparations of secobarbital sodium.

second (sec·ond) (s) (sek´ənd)  the SI unit of time, equal to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of cesium 133.

secondary (sec·on·dary) (sek´ən-dar”e) [L. secundarius, from secundus second]  second or inferior in order of time, place, or importance; derived from or consequent to a primary event or thing.

second intention (sec·ond in·ten·tion) (sek´ənd in-ten´shən)  see under healing.

secreta (se·cre·ta) (se-kre´tə) [L. pl.]  secretion (def. 2).

secretagogue (se·cret·a·gogue) (se-krēt´ə-gog) [secretion + -agogue]  1. stimulating secretion.  2. an agent that stimulates secretion.

secrete (se·crete) (se-krēt´) [L. secernere, secretum to separate]  to separate or elaborate cell products.

secretin (se·cre·tin) (se-kre´tin)  a strongly basic polypeptide hormone secreted by the mucosa of the duodenum and upper jejunum when acid chyme enters the intestine. It stimulates the release of pancreatic juice by the pancreas and to a lesser extent bile by the liver, both of which contain bicarbonate and change the pH of the duodenum from acid to alkaline, thereby facilitating the action of intestinal digestive enzymes. Secretin is used in diagnostic tests for gastrinoma and pancreatic acinar function.

secretion (se·cre·tion) (se-kre´shən) [L. secretio, from secernere to secrete]  1. the process of elaborating a specific product as a result of the activity of a gland; this activity may range from separating a specific substance of the blood to the elaboration of a new chemical substance.  2. material that is secreted.

antilytic s.  saliva secreted by the submaxillary gland with nerves intact, as distinguished from that secreted when the nerve is divided.

external s.  one discharged by an exocrine gland (q.v.) to an external or internal surface of the body. Cf. internal s.

internal s.  a hormone; a substance secreted by an organ or structure of the endocrine system (q.v.). Cf. external s.

paralytic s.  secretion from a gland after paralysis or division of its nerve.

secretogogue (se·cre·to·gogue) (se-kre´tə-gog)  secretagogue.

secretoinhibitory (se·cre·to·in·hib·i·to·ry) (se-kre”to-in-hib´ĭ-tor”e)  antisecretory (def. 1).

secretomotor (se·cre·to·mo·tor) (se-kre”to-mo´tor)  exciting or stimulating secretion; said of nerves.

secretomotory (se·cre·to·mo·tory) (se-kre”to-mo´tor-e)  secretomotor.

secretor (se·cre·tor) (se-kre´tor)  1. an individual possessing the autosomal dominant trait of secreting the ABH antigens of the ABO blood group in the saliva and other body fluids. See also nonsecretor.  2. the autosomal dominant gene that determines this trait.

secretory (se·cre·to·ry) (se-kre´tə-re, se´krə-tor”e)  pertaining to secretion or affecting the secretions.

sectile (sec·tile) (sek´tīl) [L. sectilis, from secare to cut]  1. susceptible of being cut.  2. one of several parts into which a whole is divided.

sectio (sec·tio) (sek´she-o)  pl. sectio´nes [L., from secare to cut]  1. an act of cutting.  2. section: anatomic terminology for a segment or subdivision of an organ.

section (sec·tion) (sek´shən) [L. sectio]  1. an act of cutting.  2. a cut surface.  3. a segment or subdivision of an organ; called also sectio [TA].  4. a supplemental taxonomic category subordinate to a subgenus but superior to a species or series.

abdominal s.  laparotomy.

celloidin s.  a section cut by a microtome from tissue that has been embedded in celloidin.

cesarean s.  incision through the abdominal and uterine walls for delivery of a fetus. Called also abdominal delivery.

Click here to view image ■Cesarean section. (A), Classic; (B), low vertical; (C), transverse incisions.

cesarean s., cervical  cesarean s., lower segment.

cesarean s., classic ,  cesarean s., corporeal  cesarean section in which the upper segment, or corpus, of the uterus is incised.

cesarean s., extraperitoneal  cesarean section performed without incision of the peritoneum, the peritoneal fold being displaced upward and the bladder being displaced downward or to the midline, the uterus then being opened by an incision in its lower segment.

cesarean s., Latzko's  extraperitoneal cesarean section with the uterine incision made through one side of the lower segment of the uterus.

cesarean s., lower segment  cesarean section in which the lower uterine segment is incised, either transperitoneally or extraperitoneally.

cesarean s., low vertical  cesarean section done transperitoneally with a low vertical uterine incision that is usually made after downward reflection of the bladder.

cesarean s., Munro Kerr  cesarean section in which the lower uterine segment is opened transversely through the uterovesical fold, without displacement of the bladder.

cesarean s., Porro  cesarean section with extirpation of the uterine corpus and ovaries; of historical interest.

cesarean s., transperitoneal  cesarean section performed with an incision through the uterovesical fold of peritoneum.

cesarean s., transverse  cesarean section done transperitoneally with incision of the enterovesical peritoneum and downward displacement of the bladder followed by a low transverse version of the uterus.

coronal s.  frontal s.

frontal s.  a longitudinal section parallel with the long axis of the body and at right angles to a sagittal section; it divides the body into a dorsal and a ventral part. Called also coronal s.

frozen s.  a section cut by a microtome from tissue that has been frozen.

paraffin s.  a section cut by a microtome from tissue which has been embedded in paraffin.

perineal s.  external urethrotomy.

Saemisch's s.  Saemisch's operation.

sagittal s.  a longitudinal section that follows the sagittal suture and runs the entire length of the body, thus dividing the latter into more or less equal right and left halves, or a section parallel to it.

serial s.  histologic section made in a consecutive order and so arranged for the purpose of microscopic examination.

transverse s.  one made at right angles to the long axis of a body or structure.

sectiones (sec·ti·o·nes) (sek”she-o´nēz) [L.]  plural of sectio.

sector (sec·tor) (sek´tər) [L. “cutter”]  1. the area of a circle included between an arc and the radii bounding it.  2. an area, zone, or part of something.  3. to divide into sectors.

sectorial (sec·to·ri·al) (sek-tor´e-əl) [L. sector cutter]  1. pertaining or relating to a sector.  2. in genetics, pertaining to the presence of a sector of tissue which carries a somatic mutation and which is therefore different phenotypically from the tissues of the rest of the body; also, an individual having such a sector of tissue (a mosaic).  3. cutting or adapted for cutting, as the molar teeth of carnivores.

Sectral (Sec·tral) (sek´tral)  trademark for a preparation of acebutolol hydrochloride.

secundigravida (se·cun·di·grav·i·da) (sə-kun”dĭ-grav´ĭ-də) [L. secundus second + gravida]  a woman pregnant for the second time; also written gravida II.

secundina (se·cun·di·na) (sek”ən-di´nə)  pl. secundi´nae [L., from secundus following]  afterbirth.

s. u´teri  chorion.

secundinae (se·cun·di·nae) (sek”ən-di´ne) [L.]  afterbirth.

secundines (se·cun·dines) (se-kun´dīnz, se-kun´dēnz) [L. secundinae]  afterbirth.

secundipara (se·cun·dip·a·ra) (se”kən-dip´ə-rə) [L. secundus second + para]  a woman who has had two pregnancies which resulted in viable offspring; also written para II.

secundiparity (se·cun·di·par·i·ty) (se-kun”dĭ-par´ĭ-te)  the condition of being a secundipara.

secundiparous (se·cun·dip·a·rous) (se”kən-dip´ə-rəs)  having borne viable offspring in two separate pregnancies.

secundum artem (se·cun·dum ar·tem) (se-kun´dəm ahr´təm) [L. “according to the art”]  in an approved or professional manner.

SED (SED)  skin erythema dose; see erythema dose, under dose.

Sedapap (Sed·a·pap) (sed´ə-pap)  trademark for a combination preparation of butalbital and acetaminophen

sedation (se·da·tion) (sə-da´shən) [L. sedatio]  the production of a sedative effect; the act or process of calming.

conscious s.  a state of sedation in which the conscious patient is rendered free of fear, apprehension, and anxiety through the use of pharmacologic agents.

sedative (sed·a·tive) (sed´ə-tiv) [L. sedativus]  1. allaying activity and excitement.  2. an agent that allays excitement; see also tranquilizer. Called also calmative.

cardiac s.  one that abates the force of the heart's action.

cerebral s.  one which principally affects the brain.

gastric s.  one which soothes or lessens irritability of the stomach.

general s.  one which affects all the organs and functions.

intestinal s.  one which diminishes intestinal irritation; in general, they are also gastric sedatives.

nerve trunk s.  one which acts upon the trunks of the nerves.

nervous s.  a sedative which acts upon and through the nervous system; the cerebral, spinal, and nerve trunk sedatives belong to this class.

respiratory s.  one which affects especially the respiratory centers and organs.

spinal s.  any drug which abates the functional or abnormal activity of the spinal cord.

vascular s.  one which affects the vasomotor activities.

sedentary (sed·en·tary) (sed´ən-tar”e) [L. sedentarius]  1. sitting habitually; of inactive habits.  2. pertaining to a sitting posture.

Sédillot's operation (Sé·dil·lot's operation) (sa-de-yōz´) [Charles Emmanuel Sédillot, French surgeon, 1804–1883]  see under operation.

sediment (sed·i·ment) (sed´ĭ-mənt) [L. sedēre to settle]  a precipitate, especially one that is formed spontaneously.

urinary s.  the deposit of solid matter left after the urine has been allowed to stand for some time or after centrifugation.

sedimentable (sed·i·ment·a·ble) (sed”ĭ-ment´ə-bəl)  in microbiology, capable of forming sediment.

sedimentation (sed·i·men·ta·tion) (sed”ĭ-mən-ta´shən)  the act of causing the deposit of sediment, especially by the use of a centrifuge.

erythrocyte s.  the sedimentation of erythrocytes in a volume of drawn blood; see erythrocyte sedimentation rate, under rate.

Ritchie's formalin-ether s.  see under method.

sedimentator (sed·i·men·ta·tor) (sed”ĭ-mən-ta´tor)  a centrifuge for separating sediments from the urine.

sedoheptulose (sedo·hep·tu·lose) (se”do-hep´tu-lōs)  a seven-carbon ketose occurring in phosphorylated form (sedoheptulose 7-phosphate) as an intermediate in the pentose phosphate pathway.

seed (seed) (sēd)  1. the mature ovule of a flowering plant; called also semen.  2. a small cylindrical shell of gold or other suitable material, used in application of radiation therapy.  3. to inoculate a culture medium with microorganisms.

cardamom s.  [NF]  cardamom (def. 3).

grape s.  a preparation of the seeds of grapes, having antioxidant, antimutagenic, and antiinflammatory properties; used orally for the prevention of atherosclerosis and cancer and in folk medicine for the treatment of circulatory disorders.

plantago s.  [USP] ,  psyllium s.  the cleaned, dried, ripe seed of Plantago psyllium, P. indica, or P. ovata, used as a bulk-forming laxative. The mucilaginous portion of the seeds of P. ovata is used in preparing psyllium hydrophilic mucilloid.

radiogold (¹⁹⁸Au) s.  a solid piece of radioactive gold wire about 2.5 mm long and 0.8 mm thick, which has been used as a permanent interstitial radioactive implant in the treatment of certain types of cancer.

radon s.  a small sealed container or tube for carrying radon, made of gold or glass, for insertion into tissues for the treatment of certain malignant diseases; it is visible radiographically.

Seessel's pouch (pocket) (Sees·sel's pouch (pocket)) (se´selz) [Albert Seessel, American embryologist and neurologist, 1850–1910]  see under pouch.