"the two protuberances which form the rump in men and animals," c. 1300, probably from Old English buttuc "end, short piece of land," from Proto-Germanic *butaz, from PIE root *bhau- "to strike," thus related to butt (n.1).
buttery
butthead
butthole
buttinski
buttock
buttocks
button
button-hole
buttonwood
buttress
butty
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