the GNU version of the Collaborative International Dictionary of English
n. Inflammation of the brain.
The Century Dictionary and Cyclopedia
n. In pathology, inflammation of the brain.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
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)
Word Usage
"For somebody who develops a severe, debilitating disease, such as encephalitis, which is a swelling and infection of the brain, that usually requires more supportive measures within a hospital."