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Noun: invagination  in,va-ju'ney-shun
  1. The condition of being folded inward or sheathed
    - introversion
  2. The folding in of an outer layer so as to form a pocket in the surface
    "the invagination of the blastula";
    - introversion, intussusception, infolding

Derived forms: invaginations

Type of: biological process, condition, organic process

Encyclopedia: Invagination