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Arachnoid may refer to:
- Relating to arachnids
- Arachnoid mater, a layer of the meninges, membranes that contain the central nervous system
- Arachnoid (astrogeology), a geological structure found only on the planet Venus
- Arachnoid (botany), referring to organs with a cobwebby exterior appearance
- Arkanoid, an arcade game
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