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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.
How to Cure Arachnophobia. Arachnophobia, or the fear of spiders, has been around for centuries. Learn the surprising origins of this historical phobia and what treatment options are available to cure arachnophobia. slide 1 of 3. The Definition of Arachnophobia Arachnophobia is an anxiety disorder revolving around the fear of spiders.