Etymology
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moo (v.)

"to make the characteristic cry of a cow, to low," 1540s, of imitative origin (compare Latin mūgire "to low, moo," Lithuanian mūkiu "to bellow," Middle High German mūhen "to low, bellow," and see PIE root *gwou-). Related: Mooed; mooing. The noun "the low of a cow" is from 1789. Baby-talk moo-cow (n.) "a cow" is attested from 1812.

updated on March 19, 2019

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Definitions of moo from WordNet
1
moo (v.)
make a low noise, characteristic of bovines;
Synonyms: low
2
moo (n.)
the sound made by a cow or bull;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.