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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.
Adhesive Arachnoiditis is a chronic, insidious inflammatory reaction of the arachnoid matter of the spinal meninges and intrathecal neural elements that cause debilitating, intractable pain and a range of other neurological problems.dhesive Arachnoiditis is a chronic, insidious inflammatory reaction of the arachnoid matter of the spinal meninges and intrathecal neural elements that cause debilitating, intractable pain and a range of other neurological problems.