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Noun: blastosphere  'blas-tu,sfeer
  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
    - blastula

Derived forms: blastospheres

Type of: conceptus, embryo, fertilised egg [Brit], fertilized egg

Encyclopedia: Blastosphere