/ Dictionary / Index E ectoenzyme: Meaning and Definition of Find definitions for: ec•to•en•zyme Pronunciation: (ek"tō-en'zīm), [key] — n. Biochem. exoenzyme. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ectoderm ectogenesis Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language