Dictionary

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

Browse

Next Word in the Dictionary: spiral conveyorPrevious Word in the Dictionary: spiral chuteAll Words Near: spiral cleavage
July 01, 2015
precarious Hear it
not certain, secure, or steady
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears