/ Dictionary / Index T toxicant: Meaning and Definition of Find definitions for: tox•i•cant Pronunciation: (tok'si-kunt), [key] — adj. poisonous; toxic. —n. a poison. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: toxicant (Thesaurus) toxic toxication Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language