/ Dictionary / Index T teratology: Meaning and Definition of Find definitions for: ter•a•tol•o•gy Pronunciation: (ter"u-tol'u-jē), [key] — n. Biol. the science or study of monstrosities or abnormal formations in organisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: teratology (Thesaurus) teratoid teratoma Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language