cuticle >> /ˈkjudək(ə)l/
Definition: [noun] A protective and waxy or hard layer covering the epidermis of a plant, invertebrate, or shell.
Example: The waxy cuticle of this plant epidermis is there to help keep the plant from drying out.
Definition: [noun] The outer cellular layer of a hair.
Example: Hair care products are designed in different ways to interact with the cuticle of the hair, which is the outer layer.
Definition: [noun] The dead skin at the base of a fingernail or toenail.
Example: Creams soften the nails and feet, toenails are trimmed and an oscillating machine tidies up the cuticles and removes dead or hard skin.