hypoderm

from The Collaborative International Dictionary of English v.0.48

Hypoblast \Hy"po*blast\, n. [Pref. hypo- + -blast.] (Biol.)
   The inner or lower layer of the blastoderm; -- called also
   {endoderm}, {entoderm}, and sometimes {hypoderm}. See Illust.
   of {Blastoderm}, {Delamination}, and {Ectoderm}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Hypoderm \Hyp"o*derm\, n. [Pref. hypo- + -derm.] (Biol.)
   Same as {Hypoblast}.
   [1913 Webster]