/ Dictionary / Index P pollutant: Meaning and Definition of Find definitions for: pol•lu•tant Pronunciation: (pu-lt'nt), [key] — n. something that pollutes. any substance, as certain chemicals or waste products, that renders the air, soil, water, or other natural resource harmful or unsuitable for a specific purpose. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pollutant (Thesaurus) poll tax pollute Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language