/ Dictionary / Index O -opsis: Meaning and Definition of Find definitions for: -opsis Pronunciation: [key] a combining form meaning “likeness,” used esp. in the names of living organisms and organic structures that resemble the thing named by the initial element: coreopsis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. opsin opsonic Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language