n.

1. 【解】表皮；外皮
   To cure your wounds, the dermatologist will have to remove your epidermis and transplant a new one.

   要医治好你的伤，皮肤科大夫必须移除你的外皮并移植一块新的皮肤。

n.

1. Zoology  & Anatomy  the surface epithelium of the skin of an animal, overlying the dermis.
2. Botany  the outer layer of tissue in a plant.