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a combining form meaning “monster,” used in the formation of compound words:
Also, especially before a vowel, terat-.
Origin of terato-
< Greek terat- (stem of téras) monster, marvel + -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for terato-


combining form
indicating a monster or something abnormal: teratism, teratoid
Word Origin
from Greek terat-, teras monster, prodigy
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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terato- in Medicine

terato- pref.
Teras: teratogen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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