am·ni·a (Äm'nÄ“-É™)
n. A plural of amnion.
am·ni·on (Äm'nÄ“-É™n, -Ån')
n. pl. am·ni·ons or am·ni·a (-nÄ“-É™)
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.