BUTTOCK

buttock. Buttock, n. the thick part of the thigh, the rump

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But″tock (�), n. [[From Butt an end.]] 1. 1. The part at the back of the hip, which, in man, forms one of the rounded protuberances on which he sits; the rump.
2. 2. (Naut.) The convexity of a ship behind, under the stern. Mar. Dict.