also: まぐし
noun
curry-comb
A comb used for grooming horses. The term is somewhat specialized, known in equestrian or historical contexts.
厩務員が馬櫛で馬の毛並みを整えた。
The stable hand groomed the horse's coat with a curry-comb.
ブラシ is a general term for 'brush', while 馬櫛 specifically refers to a curry-comb for horses.
Compound of 馬 (uma, 'horse') and 櫛 (kushi, 'comb'). The reading うまぐし is the standard combination, while まぐし is a rare contracted form.