Etymology
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amnion (n.)

innermost membrane around the embryo of a higher vertebrate (reptiles, birds, mammals), 1660s, Modern Latin, from Greek amnion "membrane around a fetus," originally "vase in which the blood of a sacrifice was caught," which is of unknown origin; sometimes said to be from ame "bucket," or a diminutive of amnos "lamb."

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Definitions of amnion

amnion (n.)
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals);
Synonyms: amniotic sac / amnios
From wordnet.princeton.edu