/ Dictionary / Index M mucid: Meaning and Definition of Find definitions for: mu•cid Pronunciation: (my'sid), [key] — adj. Archaic. moldy; musty. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mucic acid muciferous Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language