chorion Hear it!

chorion definition

cho·rion (kôr′ē än′)

noun

  1. the outermost of the two membranes that completely envelop a fetus
  2. the outer membrane or shell of the eggs of insects and other invertebrates

Etymology: ModL < Gr chorion, fetal membrane: for IE base see yarn

Related Forms:

  • chorionic cho′·ri·on′ic (-än′ik) adjective

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