Definitions for "blastodisc"
Keywords:  yolk, blastula, cleavage, egg, embryo
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.
zone of the thick-walled part of the blastocyst; the inner cell mass.
(blass´ toe disk) • A disk of cells forming on the surface of a large yolk mass, comparable to a blastula, but occurring in animals such as birds and reptiles, in which the massive yolk restricts cleavage to one side of the egg only.