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Are you saying that ox and bull are descended from PIE *gwos?


uh uh. you suggested it..

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Latin bōs, bovis, Classical Greek βους (bous, /'bo:s/) (Modern Greek βους (bous, /'vus/)), English cow, kine, Old English cy, Sanskrit go (gaus) 'ox' are all from PIE *gwou- 'ox, bull, cow'.