Webster’s Revised Unabridged Dictionary · 1913
Endoderm
En′do·derm (ĕn′dō·dẽrm), n. [Endo- + Gr. δέρμα 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.