/ Dictionary / Index O oxidant: Meaning and Definition of Find definitions for: ox•i•dant Pronunciation: (ok'si-dunt), [key] — n. a chemical agent that oxidizes. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oxidant (Thesaurus) oxheart oxidant smog Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language