polioencephalomyelitis

noun
po·​lio·​en·​ceph·​alo·​my·​eli·​tis | \ -in-ˌsef-ə-lō-ˌmī-ə-ˈlīt-əs \
plural polioencephalomyelitides\ -​ˈlit-​ə-​ˌdēz \

Medical Definition of polioencephalomyelitis 

: inflammation of the gray matter of the brain and the spinal cord

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