The Collaborative International Dictionary of English v.0.48:
Hypodermis \Hyp`o*der"mis\, n. [NL. See Hypo-, and Derma.] 1. (Biol.) Same as Hypoblast. [1913 Webster] 2. (Zool.) Same as Hypoderma, 2. HypodicroticWordNet (r) 3.0 (2006):
hypodermis n 1: layer of cells that secretes the chitinous cuticle in e.g. arthropods