(embryology) The partial cleavage in telolecithal or megalecithal eggs in certain animals, such as birds and reptiles.
Depending mostly on the amount of yolk in the egg, cleavage can be holoblastic (complete or total) or meroblastic (incomplete or partial).
In meroblastic cleavage, only a portion of the egg divides. This is because of the large amount of yolk in the egg cell that the cleavage furrows do not penetrate the yolk.
Two major types of meroblastic cleavage:
Compare: holoblastic cleavage