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单词 amnion
释义

WordReference Random House Unabridged Dictionary of American English © 2024
am•ni•on  (am′nē ən),USA pronunciation n., pl. -ni•ons, -ni•a 
    (-nē ə).USA pronunciation 
  1. Anatomythe innermost of the embryonic or fetal membranes of reptiles, birds, and mammals;
    the sac in which the embryo is suspended.
  2. [Zool.]a similar membrane of insects and other invertebrates.
  • Greek, equivalent. to amn(ós) lamb (see yean) + -ion diminutive suffix
  • 1660–70

Collins Concise English Dictionary © HarperCollins Publishers::
amnion /ˈæmnɪən/ n ( pl -nions, -nia / -nɪə/)
  1. the innermost of two membranes enclosing an embryonic reptile, bird, or mammal
Etymology: 17th Century: via New Latin from Greek: a little lamb, from amnos a lamb
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