Etymology
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udder (n.)

Old English udder "milk gland of a cow, goat, etc.," from Proto-Germanic *udr- (source also of Old Frisian uder, Middle Dutch uyder, Dutch uijer, Old High German utar, German Euter, and, with unexplained change of consonant, Old Norse jugr), from PIE *eue-dh-r "udder" (source also of Sanskrit udhar, Greek outhar, Latin uber "udder, breast").

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Definitions of udder

udder (n.)
mammary gland of bovids (cows and sheep and goats);
Synonyms: bag
From wordnet.princeton.edu