terminal hair; bristle
Technical term in biology and dermatology for the thick, pigmented hair that replaces vellus hair after puberty, or for stiff animal hairs.
Terminal hair is the thick, dark hair that appears after puberty.
The bristles of the brush are too stiff and hurt my skin.
Compound of 硬 (hard, stiff) and 毛 (hair). A straightforward Sino-Japanese technical term.