/ Dictionary / Index S suppressant: Meaning and Definition of Find definitions for: sup•pres•sant Pronunciation: (su-pres'unt), [key] — n. a substance that suppresses an undesirable action or condition: an appetite suppressant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: suppressant (Thesaurus) suppress suppression 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