#chorionic_villus  one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta
  supertype:  #villus  a minute hairlike projection on mucous membrane
  part of:  #chorion  outermost membranous sac enclosing the embryo in higher vertebrates (reptiles; birds; mammals)
     part of:  #fetal_membrane__fetalmembrane  any membrane that functions for the protection or nourishment of respiration or excretion of a developing fetus

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