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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.
More Arachnophobia Essay Topics. Yet another simple way to describe the etymology of arachnophobia is: it has its word origin from âArachneâ meaning âspiderâ and âphobosâ meaning âfearâ. In Greek mythology, Arachna was a beautiful maiden who was later turned into a spider by her trainer Athena.