• synonyms


[buht-uh k]
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  1. Usually buttocks.
    1. (in humans) either of the two fleshy protuberances forming the lower and back part of the trunk.
    2. (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.
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Origin of buttock

before 1000; Middle English buttok, Old English buttuc. See butt1, -ock
Related formsbut·tocked, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for buttocks


  1. either of the two large fleshy masses of thick muscular tissue that form the human rumpSee also gluteus Related adjectives: gluteal, natal
  2. the analogous part in some mammals
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Word Origin

C13: perhaps from Old English buttuc round slope, diminutive of butt (unattested) strip of land; see butt 1 -ock
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for buttocks


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

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late 13c., singular of buttocks (q.v.).

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Online Etymology Dictionary, © 2010 Douglas Harper

buttocks in Medicine


  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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.