/ Dictionary / Index O opsonify: Meaning and Definition of Find definitions for: op•son•i•fy Pronunciation: (op-son'u-fī"), [key] — -fied, -fy•ing. to facilitate phagocytosis of (a microorganism, as a bacterium) by treatment with opsonin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. opsonic opsonin Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language