Hypertext Webster Gateway: "buttock"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Buttock \But"tock\, n. [From {Butt} an end.]
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. (Naut.) The convexity of a ship behind, under the stern.
--Mar. Dict.
From WordNet (r) 1.7 (wn)
buttock
n : either of the two large fleshy masses of muscular tissue
that form the human rump [syn: {cheek}]
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