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[ter-uh-tol-uh-jee] /ˌtɛr əˈtɒl ə dʒi/
noun, Biology
the science or study of monstrosities or abnormal formations in organisms.
1670-80; terato- + -logy
Related forms
[ter-uh-tl-oj-i-kuh l] /ˌtɛr ə tlˈɒdʒ ɪ kəl/ (Show IPA),
teratologist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for teratological


the branch of medical science concerned with the development of physical abnormalities during the fetal or early embryonic stage
the branch of biology that is concerned with the structure, development, etc, of monsters
a collection of tales about mythical or fantastic creatures, monsters, etc
Derived Forms
teratologic (ˌtɛrətəˈlɒdʒɪk), teratological, adjective
teratologist, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for teratological



"study of marvels and monsters," 1670s, from comb. form of Greek teras (genitive teratos) "marvel, monster" + -logy.

Online Etymology Dictionary, © 2010 Douglas Harper
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teratological in Medicine

teratology ter·a·tol·o·gy (těr'ə-tŏl'ə-jē)
The biological study of malformations and monstrosities.

ter'a·to·log'ic (-tl-ŏj'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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teratological in Science
The scientific study of birth defects.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for teratological


branch of the biological sciences dealing with the causes, development, description, and classification of congenital malformations in plants and animals and with the experimental production, in some instances, of these malformations. Congenital malformations arise from interruption in the early development of the organism. Malformations in human infants, for example, may occur because the infant's genotype contains mutant genes or includes an abnormal number of chromosomes; they also may occur if early in pregnancy the mother has had German measles (rubella), has taken some injurious drug, or has been exposed to an injurious dosage of radiation. Experimental studies suggest similar types of factors can cause malformations in animals and plants.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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