Webster’s Revised Unabridged Dictionary · 1913 Mucid Mu′cid (mū′sĭd), a. [L. mucidus, fr. L. mucus mucus. See Mucus, and cf. Moist.] Musty; moldy; slimy; mucous. — Mu′cid·ness, n. ‹ Mucic Mucific ›