Source : Webster's Revised Unabridged Dictionary (1913)

Hypodermis \Hyp`o*der"mis\, n. [NL. See {Hypo-}, and {Derma}.]
   1. (Biol.) Same as {Hypoblast}.

   2. (Zo["o]l.) Same as {Hypoderma}, 2.

Source : WordNet®

hypodermis
     n : layer of cells that secretes the chitinous cuticle in e.g.
         arthropods