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Noun: trophoblast  'trow-fu,blãst or 'tró-fu,blãst
  1. The membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall
    "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"

Derived forms: trophoblasts

Type of: membrane, tissue layer

Part of: blastosphere, blastula

Encyclopedia: Trophoblast