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amnion
[ am-nee-uhn ]
/ ˈæm ni ən /
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noun, plural am·ni·ons, am·ni·a [am-nee-uh]. /ˈæm ni ə/.
Anatomy, Zoology. the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
Zoology. a similar membrane of insects and other invertebrates.
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Origin of amnion
Words nearby amnion
amnesty, Amnesty International, amnio, amniocentesis, amniography, amnion, amniote, amniotic, amniotic fluid, amniotic sac, amn't
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use amnion in a sentence
British Dictionary definitions for amnion
amnion
/ (ˈæmnɪən) /
noun plural -nions or -nia (-nɪə)
the innermost of two membranes enclosing an embryonic reptile, bird, or mammalSee also chorion
Word Origin for amnion
C17: via New Latin from Greek: a little lamb, from amnos a lamb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Scientific definitions for amnion
amnion
[ ăm′nē-ən ]
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
The American Heritage® Science Dictionary
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