The word Arachnoid means pertaining to or resembling an arachnid or spider. It may also refer to:

• Arachnoid mater, one of the three layers of the meninges, a system of membranes that contain the central nervous system.
• Arachnoid (astrogeology), a geological structure resembling a spider web, found only on the planet Venus
• Arkanoid, an arcade game, sometimes mistakenly pronounced as "arachnoid"

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