blastodisc

from WordNet (r) 3.0 (2006)

blastodisc
    n 1: a layer of cells on the inside of the blastula [syn:
         {blastoderm}, {germinal disc}, {blastodisc}, {germinal
         area}]

from The Collaborative International Dictionary of English v.0.48

blastodisc \blastodisc\ n.
   a disc-shaped layer of cells on the surface of the yolk mass
   of an egg (such as that of a bird) which develops to form the
   embryo.

   Syn: germinal disc, germinal area.
        [WordNet 1.5 +PJC]