Encephalitis

n. inflammation of the brain

Encephalitis is an acute inflammation of the brain, commonly caused by a viral infection. Sometimes, encephalitis can result from a bacterial infection, such as bacterial meningitis, or it may be a complication of other infectious diseases like rabies (viral) or syphilis (bacterial). Certain parasitic or protozoal infestations, such as toxoplasmosis, malaria, or primary amoebic meningoencephalitis, can also cause encephalitis in people with compromised immune systems. Brain damage occurs as the inflamed brain pushes against the skull, and can lead to death.
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Encephalitis is an inflammation of the brain, usually caused by a direct viral infection or a hyper-sensitivity reaction to [more]Encephalitis - Community and Resources

Noun
1. 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)
(synonym) cephalitis, phrenitis
(hypernym) inflammation, redness, rubor
(hyponym) acute hemorrhagic encephalitis

(n.)
Inflammation of the brain.