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Answer for the clue "The opening into the archenteron ", 10 letters:
blastopore

Word definitions for blastopore in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context embryology English) The opening into the archenteron.

WordNet Word definitions in WordNet
n. the opening into the archenteron

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Blastopore \Blas"to*pore\, n. [Gr. blasto`s sprout + E. pore.] (Biol.) The pore or opening leading into the cavity of invagination, or archenteron. Note: [See Illust. of Invagination .] --Balfour.