/ Dictionary / Index O operculate: Meaning and Definition of Find definitions for: o•per•cu•late Pronunciation: (ō-pûr'kyu-lit, -lāt"), [key] — adj. having an operculum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: operculate (Thesaurus) opercle operculum Related Content Daily Word Quiz: dispel Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language