WordReference Random House Learner's Dictionary of American English © 2017
moo /mu/USA pronunciation   n., pl.  moos, v.,  mooed, moo•ing. 
n. [count]
  1. Animal Behaviorthe deep, low sound a cow makes.

v. [no object]
  1. Animal Behaviorto make such a sound.

WordReference Random House Unabridged Dictionary of American English © 2017
moo  (mo̅o̅),USA pronunciation v.,  mooed, moo•ing, n., pl.  moos. 
v.i. 
  1. to utter the characteristic deep sound of a cow;
    low.

n. 
  1. a mooing sound.
  • imitative 1540–50


Collins Concise English Dictionary © HarperCollins Publishers::

moo /muː/ vb
  1. (intransitive) (of a cow, bull, etc) to make a characteristic deep long sound; low
interj
  1. an instance or imitation of this sound



'mooing' also found in these entries:
moo
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