terato-

1.
a combining form meaning “monster,” used in the formation of compound words:
teratology.
Also, especially before a vowel, terat-.
Origin
< Greek terat- (stem of téras) monster, marvel + -o-
British Dictionary definitions for terato-

terat-

combining form
1.
indicating a monster or something abnormal: teratism, teratoid
Word Origin
from Greek terat-, teras monster, prodigy
terato- in Medicine

terato- pref.
Teras: teratogen.