buttock Meaning, Definition & Usage
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noun either of the two large fleshy masses of muscular tissue that form the human rump
cheek.
WordNet
But"tock noun
Etymology
FromDefinitions
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The part at the back of the hip, which, in man, forms one of the rounded protuberances on which he sits; the rump. -
(Naut.) The convexity of a ship behind, under the stern. Mar. Dict.