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arachnoid

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Arachnoid
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a⋅rach⋅noid

  [uh-rak-noid]
Use arachnoid in a Sentence
–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; < NL arachnoīdes < Gk arachnoeids cobweblike. See arachnid, -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Arachnoid
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a·rach·nid   (ə-rāk'nĭd)   
n.  Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks, characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen. Also called arachnoid.

[From New Latin Arachnida, class name, from Greek arakhnē, spider.]
a·rach'ni·dan (-nĭ-dən) adj. & n.
a·rach·noid   (ə-rāk'noid')   
adj.  

  1. Anatomy Of or relating to a delicate membrane enclosing the spinal cord and brain.

  2. Of, relating to, or resembling arachnids.

  3. Covered with or consisting of thin, soft, entangled hairs or fibers resembling those of a cobweb or spider's web.

n.  

  1. See arachnid.

  2. Anatomy A delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.


[New Latin arachnoīdēs, from Greek arakhnoeidēs, cobweblike : arakhnē, spider + -oeidēs, -oid.]
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: 1arach·noid
Pronunciation: &-'rak-"noid
Function: noun
: a thin membrane of the brain and spinal cord that lies between thedura mater and the pia mater

Main Entry: 2arachnoid
Variant: also arach·noi·dal /&-"rak-'noid-&l/
Function: adjective
: ofor relating to the arachnoid arachnoid membrane>
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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