plural noun, singular meninx [mee-ningks] . Anatomy.
the three membranes covering the brain and spinal cord. Compare arachnoid ( def 6 ), dura mater, pia mater.

1610–20; < Neo-Latin < Greek mḗninges, plural of mêninx membrane

meningeal [mi-nin-jee-uhl] , adjective
intermeningeal, adjective
postmeningeal, adjective
submeningeal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
meninges (mɪˈnɪndʒiːz)
pl n , sing meninx
dura mater arachnoid See pia mater the three membranes that envelop the brain and spinal cord
[C17: from Greek, pl of meninx membrane]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
meninges   (mə-nĭn'jēz)  Pronunciation Key 
The three membranes that enclose the vertebrate brain and spinal cord: the pia mater, arachnoid, and dura mater.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
meninges [(muh-nin-jeez)]

The membranes that surround the brain and spinal cord.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Migraine pain is thought to come from irritation of the meninges, membranes
  around the brain and central nervous system.
The infection usually spreads from the respiratory tract to the bloodstream,
  and then to the meninges.
Click the icon to see an image of the meninges of the brain.
The connective tissue covering on the brain and spinal cord, within the dorsal
  cavity, are called meninges.
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