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arachnoid

[uh-rak-noid] /əˈræk nɔɪd/
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
1745-1755
1745-55; < Neo-Latin arachnoīdes < Greek arachnoeidḗs cobweblike. See arachnid, -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for arachnoid
  • arachnoid having a cobwebby appearance with entangled hairs.
British Dictionary definitions for arachnoid

arachnoid

/əˈræknɔɪd/
noun
1.
the middle of the three membranes that cover the brain and spinal cord See meninges
2.
another name for arachnid
adjective
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for arachnoid
adj.

"cobweb-like," especially of the membrane around the brain and spinal cord, 1789, from Modern Latin arachnoides, from Greek arakhnoeides "cobweb-like," from arakhne "cobweb" (see arachnid) + -oeides (see -oid).

Online Etymology Dictionary, © 2010 Douglas Harper
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arachnoid in Medicine

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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arachnoid in Science
arachnoid
  (ə-rāk'noid')   
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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