/ Dictionary / Index O opacify: Meaning and Definition of Find definitions for: o•pac•i•fy Pronunciation: (ō-pas'u-fī"), [key] — v., -fied, -fy•ing. —v.t. to cause to become opaque. —v.i. to become opaque. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: opacify (Thesaurus) OPA opacity Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language