discoblastic

from The Collaborative International Dictionary of English v.0.48

Discoblastic \Dis`co*blas"tic\, a. [Gr. ? disk + ? to grow.]
   (Biol.)
   Applied to a form of egg cleavage seen in osseous fishes,
   which occurs only in a small disk that separates from the
   rest of the egg.
   [1913 Webster]