[ moo ]
/ mu /

verb (used without object), mooed, moo·ing.

to utter the characteristic deep sound of a cow; low.

noun, plural moos.

a mooing sound.

Origin of moo

First recorded in 1540–50; imitative Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for moo

British Dictionary definitions for moo


/ (muː) /


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


an instance or imitation of this sound
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.

Online Etymology Dictionary, © 2010 Douglas Harper