[kahr-sin-uh-juhn, -jen, kahr-suh-nuh-jen, -noh-]
noun Pathology.
any substance or agent that tends to produce a cancer.

1935–40; carcino- + -gen

carcinogenic [kahr-suh-nuh-jen-ik, -noh-] , adjective
carcinogenicity [kahr-suh-noh-juh-nis-i-tee] , noun
anticarcinogen, noun
anticarcinogenic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
carcinogen (kɑːˈsɪnədʒən, ˈkɑːsɪnəˌdʒɛn)
pathol any substance that produces cancer
[C20: from Greek karkinoscancer + -gen]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1853, from carcinoma + -gen "giving birth to" (see genus).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

carcinogen car·cin·o·gen (kär-sĭn'ə-jən, kär'sə-nə-jěn')
A cancer-causing substance or agent.

car'cin·o·gen'ic (kär'sə-nə-jěn'ĭk) adj.
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
carcinogen   (kär-sĭn'ə-jən)  Pronunciation Key 
A substance or agent that can cause cells to become cancerous by altering their genetic structure so that they multiply continuously and become malignant. Asbestos, DDT, and tobacco smoke are examples of carcinogens.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It also has been linked to high blood cancer in adults and is a probably human
Cadmium is a carcinogen and long-term exposure leads to kidney and bone damage.
The standard dry-cleaning solvent, perchloroethylene, is a groundwater
  contaminant and probable human carcinogen.
If absorbed in moderate doses only, it can be a carcinogen.
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