‖n. [ L., fr. Gr. freni^tis, fr. frh`n, freno`s. ] 1. (Med.) Inflammation of the brain, or of the meninges of the brain, attended with acute fever and delirium; -- called also cephalitis. [ 1913 Webster ]
(n)inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use), Syn.phrenitis, cephalitis