/ Dictionary / Index M muc-: Meaning and Definition of Find definitions for: muc- Pronunciation: [key] var. ofbefore a vowel: mucin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mubarak MU car Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language