1. Bot. (See quot.)
1866. Treas. Bot., Epiblast, a small transverse plate (a second cotyledon), found on the embryo of some grasses.
2. Biol. The outermost of the three layers constituting the wall of the blastoderm when fully formed.
1877. Huxley, Anat. Inv. Anim., i. 50. The inner wall of the sac is the hypoblast (endoderm of the adult), the outer the epiblast (ectoderm).
1881. Mivart, Cat, 319. The epiblast investing the whole ovum within the vitelline membrane.
