radial cleavage

noun

Definition of radial cleavage 

: holoblastic cleavage that is typical of deuterostomes and that is characterized by arrangement of the blastomeres of each upper tier directly over those of the next lower tier resulting in radial symmetry around the pole to pole axis of the embryo — compare spiral cleavage

First Known Use of radial cleavage

1973, in the meaning defined above

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The first known use of radial cleavage was in 1973

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