1. the blastula of a placental mammal in which some differentiation of cells has occurred; [syn: blastocyst, blastodermic vessicle]
WordNet (r) 3.0 (2006):
blastodermic vessicle
n 1: the blastula of a placental mammal in which some
differentiation of cells has occurred [syn: blastocyst,
blastodermic vessicle]