/ Dictionary / Index Z zymo-: Meaning and Definition of Find definitions for: zymo- Pronunciation: [key] a combining form meaning “ferment,” “leaven,” used in the formation of compound words: zymology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. zyme zymogen Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language