[myoo-tuh-juhn, -jen]
a substance or preparation capable of inducing mutation.

1945–50; muta(tion) + -gen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mutagen (ˈmjuːtədʒən)
a substance or agent that can induce genetic mutation
[C20: from mutation + -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

1946, from mutation + -gen, from Gk. -genes "formation, creation" (see genus). Related: Mutagenic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mutagen mu·ta·gen (myōō'tə-jən, -jěn')
An agent, such as ultraviolet light or a radioactive element, that can induce or increase the frequency of mutation in an organism.

mu'ta·gen'ic adj.
mu'ta·gen'i·cal·ly adv.
mu'ta·ge·nic'i·ty (-jə-nĭs'ĭ-tē) n.
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
Cultural Dictionary
mutagen [(myooh-tuh-juhn, myooh-tuh-jen)]

Something that causes mutations in living things. Mutagens include chemicals, such as drugs or toxins, and radiation.

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 for mutagen
Alcohol is an example of a chemical carcinogen that is not a mutagen.
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