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amnion

 - 6 dictionary results

am⋅ni⋅on

  [am-nee-uhn]
Use amnion in a Sentence
–noun, plural -ni⋅ons, -ni⋅a  [-nee-uh] .
1. Anatomy, Zoology. the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
2. Zoology. a similar membrane of insects and other invertebrates.
Origin:
1660–70; < Gk, equiv. to amn(ós) lamb (see yean ) + -ion dim. suffix
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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am·ni·on   (ām'nē-ən, -ŏn')   
n.   pl. am·ni·ons or am·ni·a (-nē-ə)
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.

[Greek amniōn.]
am'ni·ot'ic (-ŏt'ĭk), am'ni·on'ic (-ŏn'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: am·ni·on
Pronunciation: 'am-nE-"än, -&n
Function: noun
Inflected Form: plural amnions or am·nia /-nE-&/
: a thin membrane forming a closed sac about the embryos of reptiles, birds, and mammals and containing a serous fluid in which the embryo isimmersed called also amniotic sac
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

amnion am·ni·on (ām'nē-ən, -ŏn')
n. am·ni·ons or am·ni·a (-nē-ə)
The thin, membranous sac filled with a serous fluid in which the embryo or fetus is enclosed and suspended in the uterus. Also called amniotic sac.

am'ni·ot'ic (-ŏt'ĭk) or am'ni·on'ic (-ŏn'ĭk) adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
amnion   (ām'nē-ən)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia

amnion

in reptiles, birds, and mammals, a membrane forming a fluid-filled cavity (the amniotic sac) that encloses the embryo. The amniotic sac and the fluid it contains are sometimes referred to as the bag of waters

Learn more about amnion with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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