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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.
Brief Synopsis: Arachnoiditis-A pain disorder caused by inflammation of the arachnoid, a membrane that surrounds and protects nerves in the spinal cord. A number of people with arachnoiditis are unable to work and experience significant disability because they are in constant pain.. Arachnoiditis Diagnosis.he disorder is characterized by severe stinging, burning pain and neurological issues. Arachnoiditis has no consistent pattern of symptoms, yet in many people it affects the nerves connecting to the lower back and legs.