blastopore

[ blas-tuh-pawr, -pohr ]

/ ˈblæs təˌpɔr, -ˌpoʊr /

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the opening of an archenteron.

QUIZZES

Apostrophes can be tricky; prove you know the difference between it’s and its in this crafty quiz!

Question 1 of 12

On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

1875–80; blasto- + -pore passage; see pore²

blas·to·por·ic

[blas-tuh-pawr-ik, -por-], /ˈblæs təˈpɔr ɪk, -ˈpɒr-/, blas·to·po·ral

[blas-tuh-pawr-uhl, -pohr-], /ˌblæs təˈpɔr əl, -ˈpoʊr-/, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

In other words, the position of the blastopore in the Selachian is not the same as in the Frog.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
It is hardly possible to help believing that the blastopore primitively represented a mouth.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
In Osseous Fishes the blastopore undergoes a similar change of position.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
In the caudal region the medullary folds spread out and enclose between them the blastopore, behind which they soon meet again.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour