buttock
noun/ˈbʌtək/
/ˈbʌtək/
[usually plural]- either of the two round soft parts at the top of a person’s legs
- He fell down hard on his right buttock.
Oxford Collocations Dictionaryadjective- firm
- rounded
- bare
- …
Word OriginOld English buttuc, probably from the base of butt ‘thicker end of something’ + -ock.
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buttock