urine 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").

"absence of urination," 1838, medical Latin, from Greek an- "not, without" (see an- (1)) + ouron "urine" (see urine) + abstract noun ending -ia.