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panencephalitis

(păn′ĕn-sĕf′ə-lītĭs)
n.
  1. Encephalitis that affects both the gray and white matter of the brain, resulting in progressive loss of mental and motor functions.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.