Blastosphere

noun

Definitions

Noun
  1. 1
    A blastula
  2. 2
    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 wordnet

Etymology

From blasto- + -sphere.

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