[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).

1926, from carcinogen (q.v.).
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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American Heritage
Cultural Dictionary
carcinogenic [(kahr-suh-nuh-jen-ik)]

A descriptive term for things capable of causing cancer.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The widely used explosive is highly toxic and carcinogenic.
They also act as carriers for toxic or carcinogenic materials.
Other carcinogenic materials can be added to the wastewater by the chemicals
  used in the hydrofracking itself.
But everything known about both sets of compounds suggests they are
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