/ Dictionary / Index Z zymogen: Meaning and Definition of Find definitions for: zy•mo•gen Pronunciation: (zī'mu-jun, -jen"), [key] — n. Biochem. any of various enzyme precursor molecules that may change into an enzyme as a result of catalytic change. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: zymogen (Thesaurus) zymo- zymology Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language