/ Dictionary / Index A adulterant: Meaning and Definition of Find definitions for: a•dul•ter•ant Pronunciation: (u-dul'tur-unt), [key] — n. a substance that adulterates. —adj. adulterating. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: adulterant (Thesaurus) adult education adulterate Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language