Adjacent Words

blastosphere definitions

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WordNet (r) 3.0 (2005)

n
1: early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs [syn: blastula, blastosphere]

Webster's 1913 Dictionary

Morula Mor"u*la, n.; pl. Morul[ae]. [NL., dim. of L. morum a mulberry.] (Biol.) The sphere or globular mass of cells (blastomeres), formed by the clevage of the ovum or egg in the first stages of its development; -- called also mulberry mass, segmentation sphere, and blastosphere. See Segmentation.

Webster's 1913 Dictionary

Blastosphere Blas"to*sphere, n. [Gr. blasto`s sprout + E. sphere.] (Biol.) The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum. Note: [See Illust. of Invagination.]