SYN: blastocele.
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n.
the fluid-filled cavity that develops within the blastocyst. The cavity increases the surface area of the embryo and thus improves its ability to absorb nutrients and oxygen.
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blas·to·coele (blasґto-sēl) [blasto- + -coele] the fluid-filled cavity of the mass of cells (blastula) produced by cleavage of a zygote. Sometimes spelled blastocoel. Called also cleavage, or segmentation, cavity. blastocelic, blastocoelic adjMedical dictionary. 2011.