Dictionary
pol•lu•tant
Pronunciation: (pu-lOOt'nt), [key]—
n.
1. something that pollutes.
2. 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.