noun
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.
硬毛は思春期以降に現れる太くて色の濃い毛である。
Terminal hair is the thick, dark hair that appears after puberty.
ブラシの硬毛が硬すぎて肌に痛い。
The bristles of the brush are too stiff and hurt my skin.