am·ni·on ( m n - n, - n )n. pl. am·ni·ons or am·ni·a (-n -) A thin, tough, membranous sac that encloses the embryo or fetus of a mammal, bird, or reptile. It is filled with a serous fluid in which the embryo is suspended. [Greek amni  n.]am ni·otic (-t k), amni·onic (-nk) adj. |
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