endoderm

from WordNet (r) 3.0 (2006)

endoderm
    n 1: the inner germ layer that develops into the lining of the
         digestive and respiratory systems [syn: {endoderm},
         {entoderm}, {endoblast}, {entoblast}, {hypoblast}]

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

Endoderm \En"do*derm\, n. [Endo- + Gr. ? skin.] (Biol.)
   (a) The inner layer of the skin or integument of an animal.
   (b) The innermost layer of the blastoderm and the structures
       derived from it; the hypoblast; the entoblast. See
       Illust. of {Ectoderm}. Endodermal

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