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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

1660–70; <Greek, equivalent to amn(ós) lamb (see yean) + -ion diminutive suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for amnion

amnion
[ ămnē-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 Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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