Definition of buttock noun from the Oxford Advanced Learner's Dictionary

 

buttock

 noun
noun
BrE BrE//ˈbʌtək//
 
; NAmE NAmE//ˈbʌtək//
 
[usually plural] Body parts
 
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either of the two round soft parts at the top of a person’s legs The beating had left red weals on his buttocks (= on his bottom). See related entries: Body parts Word Origin Old English buttuc, probably from the base of butt ‘thicker end of something’ + -ock.
See the Oxford Advanced American Dictionary entry: buttock