chorions

/CH AO1 R IY0 AH0 N Z/
noun
  1. 1

    The protective and nutritive membrane in higher vertebrates that attaches the fetus to the uterus.

  2. 2

    The outer case of an insect egg.

  3. 3

    The outer membrane of seeds of plants.

Source: https://en.wiktionary.org/wiki/chorion, https://en.wiktionary.org/wiki/chorions