The story
- Proto-Indo-European · inherited from*h₁ówHdʰr̥“udder”
- Proto-Germanic · inherited from*ūdarą
- Old English · inherited fromūder“udder; breast”
- Middle English · inherited fromudder
- English todayudder
From Middle English udder, uddyr (also as uther, iddyr), from Old English ūder (“udder; breast”), from Proto-Germanic *ūdarą, from Proto-Indo-European *h₁ówHdʰr̥ (“udder”). Cognate with Saterland Frisian Jadder (“udder”), Dutch uier (“udder”), German Euter (“udder”), Swedish juver (“udder”), Icelandic júgur (“udder”), Vedic Sanskrit ऊधर् (ū́dhar), Ancient Greek οὖθαρ (oûthar), Latin ūber.
Etymology from Wiktionary, CC BY-SA 4.0.