[ am-nee-uh n ]
/ ˈæm ni ən /
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.
Words nearby amnion
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. 2019
British Dictionary definitions for amnia
/ (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
Medicine definitions for amnia
[ ăm′nē-ən, -ŏn′ ]
n. pl. am•ni•ons
The thin, membranous sac filled with a serous fluid in which the embryo or fetus is enclosed and suspended in the uterus.amniotic sac
Other words from amnionam′ni•ot′ic (-ŏt′ĭk) null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for amnia
[ 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 Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.