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   The American Heritage® Dictionary of the English Language: Fourth Edition.  2000.
 

Appendix I

Indo-European Roots
 
ENTRY:op-
DEFINITION:To work, produce in abundance. Oldest form *3ep-, colored to *3op-.
Derivatives include opera1, maneuver, manure, opulent, and cornucopia.
1. Suffixed form *op-es-. opera1, operate, operose, opus; cooperate, inure, maneuver, manure, officinal, stover, from Latin opus (stem oper-), work, with its denominative verb operr, to work, and secondary noun opera, work. 2. Italic compound *opi-fici-om (see dh-). 3. Suffixed form *op-en-ent-. opulent, from Latin dissimilated opulentus, rich, wealthy. 4. Suffixed form *op-ni-. omni-, omnibus; omnium-gatherum, from Latin omnis, all (< “abundant”). 5. Suffixed (superlative) form *op-tamo-. optimum, from Latin optimus, best (< “wealthiest”). 6. copious, copy; cornucopia, from Latin cpia, profusion, plenty, from prefixed form *co-op- (co-, collective and intensive prefix; see kom). (Pokorny 1. op- 780.)
 
 
The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved.

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