buttocks

This term is the precise anatomical designation for the posterior region of the human body. It carries a clinical or formal tone, making it appropriate for medical reports or formal descriptions, whereas terms like "bottom" or "rear" are more common in casual conversation.

Grammatically, this noun is a plurale tantum, meaning it is used almost exclusively in the plural form to refer to the pair of fleshy parts. While a single side is occasionally referred to as a "buttock," the plural form is the standard way to describe the area as a whole.