Etymology
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buttock (n.)

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

updated on October 26, 2012

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Definitions of buttock from WordNet

buttock (n.)
either of the two large fleshy masses of muscular tissue that form the human rump;
Synonyms: cheek
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.