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

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

noun, plural moos.

a mooing sound.

Nearby words

  1. mony,
  2. monza,
  3. monzambano,
  4. monzonite,
  5. monzonitic,
  6. moo goo gai pan,
  7. moo juice,
  8. moobs,
  9. mooc,
  10. mooch

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



(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