|a.||1.||(Anat.) Of or pertaining to the central nervous system consisting of the brain and spinal cord.|
|(Physiol.) a serous fluid secreted by the membranes covering the brain and spinal cord.|
|(Med.) a dangerous epidemic, and endemic, febrile disease, characterized by inflammation of the membranes of the brain and spinal cord, giving rise to severe headaches, tenderness of the back of the neck, paralysis of the ocular muscles, etc. It is sometimes marked by a cutaneous eruption, when it is often called spotted fever. It is not contagious.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.