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See more synonyms for moo on Thesaurus.com
verb (used without object), mooed, moo·ing.
  1. to utter the characteristic deep sound of a cow; low.
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noun, plural moos.
  1. a mooing sound.
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Origin of moo

First recorded in 1540–50; imitative
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for moo

groan, wail, roar, outcry, whine, shout, whistle, cheer, chatter, clamor, grunt, shriek, scream, howl, growl, exclaim, whoop, holler, coo, bark

Examples from the Web for moo

Contemporary Examples of moo

Historical Examples of moo

British Dictionary definitions for moo


  1. (intr) (of a cow, bull, etc) to make a characteristic deep long sound; low
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  1. an instance or imitation of this sound
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for moo


"to make the characteristic sound of a cow," 1540s, of imitative origin. Related: Mooed; mooing. The noun is from 1789. Baby-talk moo-cow (n.) attested from 1812.

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Online Etymology Dictionary, © 2010 Douglas Harper