/ Dictionary / Index T terato-: Meaning and Definition of Find definitions for: terato- Pronunciation: [key] a combining form meaning “monster,” used in the formation of compound words: teratology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. teratism teratogen Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language