blastopore

n. opening of the primitive intestinal tract (Embryology)

A blastopore is an opening into the archenteron during the embryonic stages of an organism. The distinction between protostomes and deuterostomes is based on the direction in which the mouth (stoma) develops in relation to the blastopore. Protostome derives from the Greek word protostoma meaning "first mouth"(πρώτος + στόμα) whereas Deuterostome's etymology is "second mouth" from the words second and mouth (δεύτερος + στόμα).
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Noun
1. the opening into the archenteron
(hypernym) orifice, opening, porta
(part-holonym) archenteron

n. blastopore, opening of the primitive intestinal tract (Embryology)

n. blastopore, opening of the primitive intestinal tract (Embryology)