fertilized egg

Definitions of fertilized egg
  1. noun
    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
    synonyms: conceptus, embryo
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    blastosphere, blastula
    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
    gastrula
    double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
    morula
    a solid mass of blastomeres that forms when the zygote splits; develops into the blastula
    blastocyst, blastodermic vessicle
    the blastula of a placental mammal in which some differentiation of cells has occurred
    type of:
    animal, animate being, beast, brute, creature, fauna
    a living organism characterized by voluntary movement
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