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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.
A. A. A. Arachnoiditis is a pain disorder caused by the inflammation of the arachnoid, one of the membranes that surrounds and protects the nerves of the spinal cord. It is characterized by severe stinging, burning pain, and neurological problems.he most common symptom is pain, but arachnoiditis can also cause: 1  Tingling, numbness, or weakness in the legs. 2  Sensations that may feel like insects crawling on the skin or water trickling down the leg. 3  Severe shooting pain that can be similar to an electric shock sensation.