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Definition of arachnoid. 1  1 : of or relating to a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater. 2  2 : covered with or composed of soft loose hairs or fibers.
Arachnids are a Class (Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. All Arachnids have multiple legs and look like Insects, the only difference is that Insects have six leg and Arachnids have 8 legs. They are largely terrestrial and solitary Animal, gathering only for mating.