a combining form meaning “monster,” used in the formation of compound words: teratology.
Also, especially before a vowel, terat-.

< Greek terat- (stem of téras) monster, marvel + -o-

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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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