Source : Webster's Revised Unabridged Dictionary (1913)

Endoblast \En"do*blast\, n. [Endo- + -blast.] (Biol.)
   Entoblast; endoplast. See {Nucleus},

Source : WordNet®

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