periblast Biol.
(ˈpɛrɪblæst)
[f. Gr. περί around + -blast.]
a. The main part of the substance of a cell, as distinct from the external cell-wall and the internal nucleus: = periplast b. b. The outer layer of protoplasm in the egg of a teleostean fish, surrounding the central yolk.
| 1857 Dunglison Med. Lex. 694 Periblast.., the amorphous matter, which surrounds the endoblast..or cell nucleus, and undergoes segmentation. 1889 H. V. Wilson Embryol. Sea Bass in Bull. U.S. Fish Comm. (1891) IX. 216 Sections through this stage are the most important for the study of the formation of the periblast. Ibid. 217 The central periblast layer becomes thicker than in the earlier stages. |