epidermis
/ˌepɪˈdɜːmɪs/noun
mass noun
1- Biology the outer layer of cells covering an organism, in particular【生】外胚层, 尤指：
1.1
- Zoology & Anatomy the surface epithelium of the skin of an animal, overlying the dermis【动, 剖】表皮。
1.2
- Botany the outer layer of tissue in a plant, except where it is replaced by periderm【植】表皮（层）, 外皮。
派生词
epidermal
adjectiveepidermic
adjectiveepidermoid
adjective词源
early 17th cent.: via late Latin from Greek, from epi 'upon' + derma 'skin'.