The word "cuticle" refers to the thin, protective layer of skin or other material that covers and protects something, such as the skin around your nails or the outer layer of plants. Full definition
If you're not providing your hair moisture, the dry cuticle of the hair can lift — which is what causes frizzy hair. (garnierusa.com)
Smooth your heels with a pumice stone, saturating them with cream and drenching each nail and the surrounding skin with cuticle oil to hydrate. (womenshealthandfitness.com.au)
The acidic pH also helps to close hair cuticles on the scalp. (wellnessmama.com)