Meaning of amnion

am•ni•on

Pronunciation: (am'nē-un), [key]
— pl. -ni•ons, -ni•a
  1. the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
  2. a similar membrane of insects and other invertebrates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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