臀

The buttocks; specifically the fleshy gluteal region.

Functions almost exclusively as a noun; does not typically undergo verbalization.

Contrast with 尻 (kāo), which often denotes the area toward the tailbone or base of the spine and carries a more colloquial tone, and 股 (gǔ), which primarily refers to the thigh but can encompass the broader hip and pelvic region.

In medical contexts (e.g., the //Neijing//), this glyph is used with clinical precision; its use over 尻 often signals a shift from general or derogatory description to anatomical terminology.