Chinese character 腄

It names thickened skin caused by repeated rubbing: a callus.

The early Chinese dictionary Shuowen Jiezi defines it as 瘢胝 (“callused skin”), and explains 腄 as 肉, the body radical, plus 垂, a sound element that hints at pronunciation. The historical work Shiji uses 黄腄 as a place name. Later dictionaries also record a bony growth on an animal’s lower leg, the buttocks, and 腄 as an alternate form of 膗 meaning “ugly.”

What if someone sends 腄 alone?

A bare message does not identify which sense the sender intends.

Its dictionary entries cover a callus, other body terms, an alternate form of 膗 meaning “ugly,” and the place name 黄腄. If there is no surrounding message, ask what the sender means; a lookup result or font test may simply be displaying the character.