1) Blastocele 2) Blastocoel 3) Bodily cavity 4) Cavity 5) Cavum 6) Cleavage cavity 7) Segmentation cavity 1) Blastocele 2) Blastocoel 
A blastocoel(e) or blastocele (also called blastocyst cavity, cleavage cavity or segmentation cavity) is the fluid-filled central region of a blastula and mammalian blastocyst. A blastocoele forms during embryogenesis when a zygote (a fertilized ovum) divides into many cells through mitosis. The adjectival of `blastocoel(e)` is blastocoelic. A b.....
• (n.) The cavity of the blastosphere, or segmentation cavity.
Synonym for blastocele ... The cavity in the blastula of a developing embryo. ... Synonym: blastocoele, cleavage cavity, segmentation cavity. ... Origin: blasto-+ G. Koilos, hollow ... (05 Mar 2000) ... 
(blas´to-sēl) the fluid-filled central segmentation cavity of the mass of the blastula.