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moo

[moo]
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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

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British Dictionary definitions for moo

moo

verb
  1. (intr) (of a cow, bull, etc) to make a characteristic deep long sound; low
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interjection
  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

v.

"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