Webster's English Dictionary

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epidermis

epi.der.mis \-m*s\ n [LL, fr. Gk, fr. epi- + derma skin] 1a: the outer 
   epithelial layer of the external integument of the animal bod y that is 
   derived from the embryonic epiblast; specif : the outer nonsensitive and 
   nonvascular layer of the skin of a vertebrate that overlies the corium 1b: 
   any of various animal integuments  2: a thin surface layer of primary 
   tissue in higher plants