/ Dictionary / Index A acidify: Meaning and Definition of Find definitions for: a•cid•i•fy Pronunciation: (u-sid'u-fī"), [key] — -fied, -fy•ing. to make or become acid; convert into an acid. to make or become sour. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acidify (Thesaurus) acidic acidimeter Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language