hair (on the head)
「髪」 has another reading with different meanings.
(a) hair
彼女は髪が長くて美しい。
She has long, beautiful hair.
髪を切りに行きたいです。
I want to go get a haircut.
朝、髪をとかしてから出かけた。
I combed my hair before going out in the morning.