arach·noid
ə-ˈrak-ˌnȯid
1
: of or relating to a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater
2
: covered with or composed of soft loose hairs or fibers
: an arachnoid membrane
: resembling or related to the arachnids
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Merriam-Webster unabridged
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