Chorion

1. n. The outer membrane of seeds of plants.
2. n. The outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development.
3. n. The true skin, or cutis.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.