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Houghton Mifflin

am·ni·on  audio  (mn-n, -n) KEY 

NOUN:
pl. am·ni·ons or am·ni·a  (-n-) KEY 
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.

ETYMOLOGY:
Greek amnin

OTHER FORMS:
amni·otic  (-tk) KEY  or amni·onic  (-nk) KEY (Adjective)


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