EXAMPLES | WORD ORIGIN adjective resembling a spider's web. of or belonging to the arachnids. . Anatomy of or relating to the arachnoid membrane. . Botany formed of or covered with long, delicate hairs or fibers. noun an arachnid. . Anatomy the serous membrane forming the middle of the three coverings of the brain and spinal cord. Origin of arachnoid 1745–55;
New Latin arachnoīdes
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for arachnoid Historical Examples of arachnoid British Dictionary definitions for arachnoid noun the middle of the three membranes that cover the brain and spinal cord See meninges adjective of or relating to the middle of the three meninges botany consisting of or covered with soft fine hairs or fibres of or relating to the arachnids
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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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
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.
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.