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noun Pathology.
  1. a disease characterized by inflammation of the gray matter of the brain.
  2. poliomyelitis affecting the cerebrum.
Also po·li·en·ceph·a·li·tis [poh-lee-en-sef-uh-lahy-tis] /ˌpoʊ li ɛnˌsɛf əˈlaɪ tɪs/.

Origin of polioencephalitis

1880–85; < New Latin < Greek polió(s) gray + New Latin encephalitis encephalitis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
polioencephalitis in Medicine


  1. An acute infectious inflammation of the brain's gray matter, either of the cortex or of the central nuclei.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.