1) Blastocele 2) Blastocoele 3) Bodily cavity 4) Cavity 5) Cavum 6) Cleavage cavity 7) Segmentation cavity 1) Blastocele 2) Blastocoele 
(from the article `blastula`) ...the development of an embryo by repeated cleavage of a fertilized egg. The cells of the blastula form an epithelial (covering) layer, called the ... The inward movement of one side of the blastula`s cells has contracted or eliminated the blastocoel, which was the cavity of the blastula, but a new ... ...
The fluid-filled cavity formed within the mass of cells of the blastula of many animals during the later stages of cleavage.
The cavity formed within the mass of cells of the blastula of many animals during the later stages of cleavage. ... (18 Nov 1997) ... 
(= blastocele (USA)) The cavity formed within the mass of cells of the blastula of many animals during the later stages of cleavage.
[n] - the fluid-filled cavity inside a blastula
blastocoele noun the fluid-filled cavity inside a blastula
The fluid-filled cavity at the center of a blastula.
the cavity of a blastula, arising in the course of cleavage.