Source : Webster's Revised Unabridged Dictionary (1913)

Blastoderm \Blas"to*derm\, n. [Gr. blasto`s sprout + E. derm.]
   (Biol.)
   The germinal membrane in an ovum, from which the embryo is
   developed.

Source : WordNet®

blastoderm
     n : a layer of cells on the inside of the blastula [syn: {germinal
         disc}, {blastodisc}, {germinal area}]