amnion

am·ni·on  (mn-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.

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[Greek amnin.]

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amni·otic (-tk), amni·onic (-nk) adj.

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amnion [ˈæmnɪən]

n pl -nions, -nia [-nɪə]

(Life Sciences & Allied Applications / Zoology) the innermost of two membranes (see also chorion) enclosing an embryonic reptile, bird, or mammal

[via New Latin from Greek: a little lamb, from amnos a lamb]

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amnion  (mn-n)

A thin, membranous sac filled with a watery fluid (called the amniotic fluid) in which the embryo or fetus of a reptile, bird, or mammal is suspended during prenatal development. Also called amniotic sac.

Thesaurus

Noun

1.

amnion - thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) amnios, amniotic sac amniote - any member of the Amniota mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk fetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus sac - a structure resembling a bag in an animal

Translations

amnion [ˈæmnɪən] n (amnions or amnia (pl)) [ˈæmnɪə] → amnio