buttocks

buttock

[buht-uhk]
noun
1.
Usually, buttocks.
a.
(in humans) either of the two fleshy protuberances forming the lower and back part of the trunk.
b.
(in animals) the rump.
2.
Sometimes, buttocks. Nautical. the aftermost portion of a hull above the water line and in front of the rudder, merging with the run below the water line.

Origin:
before 1000; Middle English buttok, Old English buttuc. See butt1, -ock

buttocked, adjective
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World English Dictionary
buttock (ˈbʌtək)
 
n
1.  See also gluteus either of the two large fleshy masses of thick muscular tissue that form the human rumpRelated: gluteal, natal
2.  the analogous part in some mammals
 
Related: gluteal, natal
 
[C13: perhaps from Old English buttuc round slope, diminutive of butt (unattested) strip of land; see butt1-ock]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

buttocks
late 13c., probably related to O.E. buttuc "end, short piece of land" (see butt (n.1)).

buttock
late 13c., sing. of buttocks (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

buttock but·tock (bŭt'ək)
n.

  1. Either of the two rounded prominences on the human torso that are posterior to the hips and formed by the gluteal muscles and underlying structures.

  2. buttocks The rear pelvic area of the human body.

The American Heritage® Stedman's Medical Dictionary
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