The Collaborative International Dictionary of English v.0.48:

Derma \Der"ma\, n. [NL. See Derm.] (Anat.)
   See Dermis.
   [1913 Webster]

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]

WordNet (r) 3.0 (2006):

derma
    n 1: the deep vascular inner layer of the skin [syn: dermis,
         corium, derma]