- a combining form meaning “monster,” used in the formation of compound words: teratology.
Also especially before a vowel, terat-.
Origin of terato-
< Greek terat- (stem of téras) monster, marvel + -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.