noun
1.
a. : blastodisc
b. : blastoderm
2. or embryonic shield : the part of the inner cell mass of a blastocyst from which the embryo of a placental mammal develops
noun
1.
a. : blastodisc
b. : blastoderm
2. or embryonic shield : the part of the inner cell mass of a blastocyst from which the embryo of a placental mammal develops
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012