a mamma or mammary gland, especially when baggy and with more than one teat, as in cows.

before 1000; Middle English uddre, Old English ūder; cognate with German Euter, Latin ūber, Greek oûthar, Sanskrit ū́dhar

udder, utter.
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World English Dictionary
udder (ˈʌdə)
the large baglike mammary gland of cows, sheep, etc, having two or more teats
[Old English ūder; related to Old High German ūtar, Old Norse jūr, Latin ūber, Sanskrit ūdhar]

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Word Origin & History

O.E. udder "milk gland of a cow, goat, etc.," from P.Gmc. *udr- (cf. O.Fris., M.Du. uder, O.H.G. utar, Ger. Euter, and, with unexplained change of consonant, O.N. jugr), from PIE *udhr- (cf. Skt. udhar, Gk. outhar, L. uber "udder").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
udder   (ŭd'ər)  Pronunciation Key 
A bag-shaped part of a cow and the females of other ruminants in which milk is formed and stored and from which it is taken in suckling or milking.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for udder
This article deals with the human breast for other animals, see udder and mammary gland.
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