/ Dictionary / Index O ommateum: Meaning and Definition of Find definitions for: om•ma•te•um Pronunciation: (om"u-tē'um), [key] — pl. -te•a See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Omiya ommatidium Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language