a rach nit is, tar ach no i dit is

[Eng. arachnoid, and suffix- it is = Gr. -ιτις, implying inflammation.] [ARACHNOID.] Med.: Names given by Martinet to a formidable malady, the inflammation of the arachnoid. Sometimes the other membranes investing the brain are also affected, in which case the disease is termed Meningitis (q.v.). It is also apt to spread to the substance of the brain. A rach nit is and Meningitis are akin to apoplexy and cerebritis, from which, however, they may be distinguished by the absence of premonitory symptoms, by the occurrence of spasmodic and convulsive symptoms on both sides of the body, and by the presence of febrile excitement without decided paralysis, followed by collapse.