ep·i·the·li·al /ˌɛpəˈθiliəl/
  (a.)上皮的,上皮細胞的
  ep·i·the·li·al /ˌɛpəˈθɪlɪəl/ 形容詞
  上皮的
  Ep·i·the·li·al a. Of or pertaining to epithelium; as, epithelial cells; epithelial cancer.
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  epithelial
       adj : of or belonging to the epithelium; "epithelial layer"