pol·lu·tant

[puh-loot-nt]
noun
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.

Origin:
1890–95; pollute + -ant

non·pol·lu·tant, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
pollutant (pəˈluːtənt) [Click for IPA pronunciation guide]
 
n
a substance that pollutes, esp a chemical or similar substance that is produced as a waste product of an industrial process

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Pollutant is always a great word to know.
So is slumgullion. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a stew of meat, vegetables, potatoes, etc.
American Heritage
Medical Dictionary

pollutant pol·lut·ant (pə-l&oomacr;t'nt)
n.
Something that pollutes, especially a waste material that contaminates air, soil, or water.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pollutant   (pə-lt'nt)  Pronunciation Key 
A substance or condition that contaminates air, water, or soil. Pollutants can be artificial substances, such as pesticides and PCBs, or naturally occurring substances, such as oil or carbon dioxide, that occur in harmful concentrations in a given environment. Heat transmitted to natural waterways through warm-water discharge from power plants and uncontained radioactivity from nuclear wastes are also considered pollutants.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
High pollutant levels spur county no-burn day today.
Whatever the resource requirement or environmental pollutant produced, its
  impact is the product of the human population.
Composting manure for fertilizer helps to keep it from becoming a pollutant.
Fuel duty has also served as a useful environmental weapon, since it accurately
  targets a pollutant and changes behaviour.
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