/ Dictionary / Index T toxic: Meaning and Definition of Find definitions for: tox•ic Pronunciation: (tok'sik), [key] — adj. of, pertaining to, affected with, or caused by a toxin or poison: a toxic condition. acting as or having the effect of a poison; poisonous: a toxic drug. —n. a toxic chemical or other substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: toxic (Thesaurus) toxemic toxicant Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language