teratogen

[tuh-rat-uh-juhn, -jen, ter-uh-tuh-]
noun Biology.
a drug or other substance capable of interfering with the development of a fetus, causing birth defects.

Origin:
1900–05; terato- + -gen

teratogenic, adjective
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World English Dictionary
teratogen (ˈtɛrətədʒən, tɪˈrætə-)
 
n
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
 
terato'genic
 
adj
 
terato'genicist
 
n
 
teratoge'nicity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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

teratogenic ter·a·to·gen·ic (těr'ə-tə-jěn'ĭk)
adj.
Of, relating to, or causing malformations 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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American Heritage
Science Dictionary
teratogen   (tə-rāt'ə-jən, těr'ə-tə-)  Pronunciation Key 
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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Example sentences
It is scientifically incorrect to call cells that could be teratogenic and produce self-limiting growths cancerous.
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