单词 | chorion |
释义 | Word Frequency chorion(ˈkɔːrɪən) noun the outer of two membranes that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammals See also amnion Derived forms chorionic (ˌchoriˈonic) or chorial (ˈchorial) adjective Word origin C16: from Greek khorion afterbirth |
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