arachnoid

[uh-rak-noid]
adjective
1.
resembling a spider's web.
2.
of or belonging to the arachnids.
3.
Anatomy. of or pertaining to the arachnoid membrane.
4.
Botany. formed of or covered with long, delicate hairs or fibers.
noun
5.
an arachnid.
6.
Anatomy. the serous membrane forming the middle of the three coverings of the brain and spinal cord.


Origin:
1745–55; < Neo-Latin arachnoīdes < Greek arachnoeidḗs cobweblike. See arachnid, -oid

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World English Dictionary
arachnoid (əˈræknɔɪd)
 
n
1.  See meninges the middle of the three membranes that cover the brain and spinal cord
2.  another name for arachnid
 
adj
3.  of or relating to the middle of the three meninges
4.  botany consisting of or covered with soft fine hairs or fibres
5.  of or relating to the arachnids

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

arachnoid
"cobweblike," esp. of the membrane around the brain and spinal cord, 1789, from Mod.L. arachnoides, from Gk. arakhnoeides "cobweb-like," from arakhne "cobweb" (see arachnid) + -oeides (see -oid).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

arachnoid a·rach·noid (ə-rāk'noid')
adj.
Resembling a cobweb. Used of the arachnoid membrane covering the brain and spinal cord.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
arachnoid   (ə-rāk'noid')  Pronunciation Key 
The delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for arachnoid
Arachnoid having a cobwebby appearance with entangled hairs.
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