choria

Noun

chorion (plural chorions or choria)

1. The protective and nutritive membrane in higher vertebrates that attaches the fetus to the uterus.
   • The allantois fuses with the chorion, forming a small round area, the allentochorion. This region becomes the placenta (Fig. 3).2002, Rovert E. A. Stewart, Barbara E. Stewart, Female Reproductive Systems, entry in Encyclopedia of Marine Mammals, page 425
2. The outer case of an insect egg.
   • The chorion has a predominantly lamellar structure, the lamellae being two-dimensional networks of protein fibrils.1994, Klaus Urich, Comparative Animal Biochemistry, page 392
3. The outer membrane of seeds of plants.