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[tuh-rat-uh-juh n, -jen, ter-uh-tuh-] /təˈræt ə dʒən, -ˌdʒɛn, ˈtɛr ə tə-/
noun, Biology.
a drug or other substance capable of interfering with the development of a fetus, causing birth defects.
Origin of teratogen
1900-05; terato- + -gen
Related forms
teratogenic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for teratogen


/ˈtɛrətədʒən; tɪˈrætə-/
any substance, organism, or process that causes malformations in a fetus. Teratogens include certain drugs (such as thalidomide), infections (such as German measles), and ionizing radiation
Derived Forms
teratogenic, adjective
teratogenicist, noun
teratogenicity, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for teratogen

1959, from comb. form of Greek teras (genitive teratos) "marvel, monster" + -gen.

Online Etymology Dictionary, © 2010 Douglas Harper
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teratogen in Medicine

teratogen te·rat·o·gen (tə-rāt'ə-jən, těr'ə-tə-)
An agent, such as a virus, a drug, or radiation, that causes malformation of an embryo or a fetus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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teratogen in Science
  (tə-rāt'ə-jən, těr'ə-tə-)   
An agent, such as a virus, a drug, or radiation, that can cause malformations in an embryo or fetus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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