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Noun arachnida has 1 sense
  1. Arachnida, class Arachnida - a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings
    --1 is a kind of class
    --1 is a member of Chelicerata, superclass Chelicerata
    --1 has members:
     arachnid, arachnoid; Phalangida, order Phalangida, Opiliones, order Opiliones; Scorpionida, order Scorpionida; Chelonethida, order Chelonethida, Pseudoscorpionida, order Pseudoscorpionida, Pseudoscorpiones, order Pseudoscorpiones; Pedipalpi, order Pedipalpi, Uropygi, order Uropygi; Araneae, order Araneae, Araneida, order Araneida; Acarina, order Acarina
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