カール (kāru) means “curl” | MotiTan Japanese Dictionary

More examples

前髪にカールをつけます。mae gami ni kā ru o tsu ke ma su

I add a curl to my bangs.

Refers to hair or another flexible thing that turns into a compact, curved shape rather than extending straight.

髪や毛を巻いて生じる、輪状または螺旋状の形。kami ya ke o ma i te shō ji ru rin jō ma ta wa ra sen jō no katachi

カール (kāru) is borrowed from English curl, a word that developed through Middle English from an older word for a curl or twist.

In Japanese hair styling, カール (kāru) often names the finished curl, while English curl also commonly names the action of making it.