GNU Collaborative International Dictionary of English

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  1.       

    Invagination , n. [L. pref. in- + vagina sheath.]
    1913 Webster
    1. (Biol.) The condition of an invaginated organ or part.
      1913 Webster
    2. The inward movement of the wall of a tissue or cell, to form a cavity; also, the cavity thus formed.
      PJC
    3. Specifically: (Biol., Embryology) The inward movement of one part of the wall of a blastula, to form a gastrula; the process of gastrulation, in which layers of the ovum are differentiated.
      1913 Webster
      +PJC
      ☞ In embolic invagination, one half of the blastosphere is pushed in towards the other half, producing an embryonic form known as a gastrula. -- In epibolic invagination, a phenomenon in the development of some invertebrate ova, the epiblast appears to grow over or around the hypoblast.
      1913 Webster

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