n.[C]

1. 表皮
2. 【解】护膜
3. 【动】【植】角质层

n.

1. the dead skin at the base of a fingernail or toenail.
2. the outer cellular layer of a hair.
3. Botany  & Zoology  a protective layer covering the epidermis of a plant or invertebrate.
   ▸Anatomy  the epidermis of the body.