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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.
Arachnoiditis is a pain disorder caused by the inflammation of the arachnoid, one of the membranes that surround and protect the nerves of the spinal cord.It is characterized by severe stinging, burning pain , and neurological problems.ome neurology center neurology a-z list arachnoiditis index arachnoiditis article. Arachnoiditis has no consistent pattern of symptoms, but in many people it affects the nerves connecting to the lower back and legs. The most common symptom is pain; but, arachnoiditis can also cause: