• (a.) 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.
Dis`co·blas'tic adjective [ Greek ... 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. 
Type: Term Pronunciation: dis′kō-blas′tik Definitions: 1. Denoting a discoblastula.