[blas-tuh-pawr, -pohr]
noun Embryology.
the opening of an archenteron.

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

blastoporic [blas-tuh-pawr-ik, -por-] , blastoporal [blas-tuh-pawr-uhl, -pohr-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

blastopore blas·to·pore (blās'tə-pôr')
The opening into the archenteron formed by the invagination of the blastula to form a gastrula.

blas'to·por'ic or blas'to·por'al (-pôr'əl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


the opening by which the cavity of the gastrula, an embryonic stage in animal development, communicates with the exterior. During maturation of some animals it evolves into the anus or the mouth; in others it is covered over and contributes to the canal joining the primitive gut with the cavity of the neural tube, the primitive nervous system.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They develop their embryo by spiral cleavage, and the blastopore of the gastrula develops into the mouth.
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