blastosphere Meaning, Definition & Usage

  1. noun 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
    blastula.

WordNet

Blas"to*sphere noun
Etymology
Gr. sprout + E. sphere.
Definitions
  1. (Biol.) The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum. See Illust. of Invagination.

Webster 1913