true skin

from The Collaborative International Dictionary of English v.0.48

Dermis \Der"mis\, n. [NL. See {Derm}.] (Anat.)
   The deep sensitive layer of the skin beneath the scarfskin or
   epidermis; -- called also {true skin}, {derm}, {derma},
   {corium}, {cutis}, and {enderon}. See {Skin}, and Illust. in
   Appendix.
   [1913 Webster]