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  • WordNet 3.6
    • n blastosphere 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
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Webster's Revised Unabridged Dictionary
    • n Blastosphere (Biol) The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.See Illust. of Invagination
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Century Dictionary and Cyclopedia
    • n blastosphere In embryology: A hollow sphere (vesicular morula) composed of a single layer of blastomeres or derivative cells, inclosing a central cavity or blastocœle. The blastomeres of one hemisphere of the vesicle may have proceeded from the macromere; of the other, from a micromere. See these words.
    • n blastosphere By Haeckel restricted to the germ-vesicle, vesicular embryo, or blastodermic vesicle of the Mammalia, which follows after gastrulation, and is called by him a gastrocystis, or intestinal germ-vesicle. Also called blastula.
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Webster's Revised Unabridged Dictionary
Gr. blasto`s sprout + E. sphere,


In literature:

This embryo, resembling a hollow rubber ball filled with fluid, is called a blastosphere.
"The Whence and the Whither of Man" by John Mason Tyler
The segmentation is complete; one side of the hollow blastosphere invaginates and forms a gastrula.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various
The central part of the blastosphere is called the segmentation cavity or blastocoel.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3" by Various
Thus, an oval and an elongate egg produce respectively an oval and an elongate blastosphere.
"The Biological Problem of To-day" by Oscar Hertwig