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1. Relating to or resembling a member of the class Arachnida
   - arachnidian, spidery, spiderlike, spiderly

1. The middle of the 3 meninges
   - arachnoid membrane
    
2. Air-breathing arthropods characterized by simple eyes and four pairs of legs
   - arachnid

Derived forms: arachnoids

See also: class Arachnida

Type of: arthropod, meninges, meninx

Part of: Arachnida, class Arachnida, leptomeninges

Encyclopedia: Arachnoid