epithelial
adjective medical specialized uk/ˌep.ɪˈθiː.li.əl/ us/ˌep.ɪˈθiː.li.əl/
上皮的，上皮组织的
relating to the epithelium (= the layer of cells that cover most surfaces of the body)
Epithelial cells form tissues that make up organs such as skin and glands. 上皮细胞形成组织，组织构成器官，比如皮肤和腺体。