spiral cleavage

noun

Definition of spiral cleavage

: holoblastic cleavage that is typical of protostomes and that is characterized by arrangement of the blastomeres of each upper tier over the cell junctions of the next lower tier so that the blastomeres spiral around the pole to pole axis of the embryo — compare radial cleavage

First Known Use of spiral cleavage

1892, in the meaning defined above

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The first known use of spiral cleavage was in 1892

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Cite this Entry

“Spiral cleavage.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spiral%20cleavage. Accessed 27 Nov. 2020.

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