/ Dictionary / Index E enzyme: Meaning and Definition of Find definitions for: en•zyme Pronunciation: (en'zīm), [key] — n. Biochem. any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion. Cf. -ase. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: enzyme (Thesaurus) enzymatic enzymology Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language