Etymology
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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 arakhnē "cobweb" (see arachnid) + -oeides (see -oid).

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Definitions of arachnoid
1
arachnoid (n.)
the middle of the 3 meninges;
Synonyms: arachnoid membrane
arachnoid (n.)
air-breathing arthropods characterized by simple eyes and four pairs of legs;
Synonyms: arachnid
2
arachnoid (adj.)
relating to or resembling a member of the class Arachnida;
Synonyms: arachnidian / spidery / spiderlike / spiderly
From wordnet.princeton.edu