Origin and history of udder

mid-15c., "over-abundant," from Latin exuberantem (nominative exuberans) "superfluous; extraordinary," present participle of exuberare "be abundant, grow luxuriously," from ex, here probably "thoroughly" (see ex-), + uberare "be fruitful," related to uber "udder," from PIE root *eue-dh-r- (see udder). From 1510s as "growing luxuriantly;" figurative use, of affections, joyous emotions, etc., is by 1640s. Related: Exuberantly; exuberate; exuberating.

"waste product of the digestive system normally discharged from the bladder," also as a diagnostic tool in medicine and an ingredient in household preparations, c. 1300, from Old French orine, urine (12c.) and directly from Latin urina "urine," from PIE *ur-, which is regarded as the source also of Greek ouron "urine." It is held to be a variant of root *we-r- "water, liquid, milk" (source also of Sanskrit var "water," Avestan var "rain," Lithuanian jūrės "sea," Old English wær, Old Norse ver "sea," Old Norse ur "drizzling rain"), which is related to *eue-dh-r (see udder).