1. blastula

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.


  • cleavage cavity
  • blastodermic vessicle
  • conceptus
  • blastocele
  • blastocoel
  • trophoblast
  • embryo
  • blastosphere
  • fertilized egg
  • blastocoele
  • segmentation cavity

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Sentences with blastula

1. Noun, singular or mass
As the cell divides and multiplies, it enters the next stage of life called the blastula.