noun
: the point (as the chordamesoderm of the dorsal lip of the vertebrate blastopore) in a developing embryo that serves as a focus about which the embryo differentiates
noun
: the point (as the chordamesoderm of the dorsal lip of the vertebrate blastopore) in a developing embryo that serves as a focus about which the embryo differentiates
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012