/ Dictionary / Index D disinfectant: Meaning and Definition of Find definitions for: dis•in•fect•ant Pronunciation: (dis"in-fek'tunt), [key] — n. any chemical agent used chiefly on inanimate objects to destroy or inhibit the growth of harmful organisms. —adj. serving as a disinfectant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: disinfectant (Thesaurus) disinfect disinfest Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language