/ Dictionary / Index C contaminant: Meaning and Definition of Find definitions for: con•tam•i•nant Pronunciation: (kun-tam'u-nunt), [key] — n. something that contaminates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: contaminant (Thesaurus) contakion contaminate Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language