Definition of polioencephalitis in US English:

polioencephalitis

(also poliencephalitis)

noun

Medicine
  • Any of various inflammatory diseases of the grey matter of the brain, especially cerebral poliomyelitis (Wernicke's disease).

Origin

Late 19th century. From German Poliencephalitis from ancient Greek πολιός grey + ἐγκέϕαλος brain + German -itis.