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blastula

Definitions of blastula
  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
    synonyms: blastosphere
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    types:
    blastocyst, blastodermic vessicle
    the blastula of a placental mammal in which some differentiation of cells has occurred
    type of:
    conceptus, embryo, fertilized egg
    an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
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