Blas″to‐sphere (�), n. [Gr. βλαστόσ sprout + E. sphere.] (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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.