radial cleavage(redirected from Spiral and radial cleavage)
Also found in: Encyclopedia, Wikipedia.
radial cleavagea form of cleavage in a developing embryo where cell division occurs at right angles to previous divisions, resulting in four blastomeres being situated directly above four others.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005