Etymology

buttock

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Today it means: Each of the two large fleshy halves of the posterior part of the body between the base of the back, the perineum, and the top of the legs. Full definition →

Middle English buttok ← Old English buttuc
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The story

  1. Old English · inherited frombuttuc“end; end piece”; also, “short piece of land”
  2. Middle English · inherited frombuttok
  3. English todaybuttock

Inherited from Middle English buttok, probably from Old English buttuc (“end; end piece”; also, “short piece of land”). Attested with its current anatomical meaning since 1300. A diminutive form of what is presumably the Old English precursor of butt + -ock (diminutive suffix).

Etymology from Wiktionary, CC BY-SA 4.0.