/ Dictionary / Index O opercle: Meaning and Definition of Find definitions for: o•per•cle Pronunciation: (ō'pur-kul), [key] — n. an operculum, esp. the posterior bone of the operculum of a fish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. opera window operculate Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language