Breadcrumb Home > Dictionary > Index M moo: Meaning and Definition of Find definitions for: moo Pronunciation: (m), [key] — v., n., pl. mooed, moo•ing, moos. —v.i. to utter the characteristic deep sound of a cow; low. —n. a mooing sound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: moo (Thesaurus) monzonite mooch TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: turgid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language