subacute sclerosing panencephalitis
noun
subacute sclerosing pan·en·ceph·a·li·tis
-ˌpan-in-ˌse-fə-ˈlī-təs
: a usually fatal neurological disease of children and young adults caused by infection of the brain by a previously latent measles virus that is marked especially by behavioral changes, myoclonic seizures, progressive deterioration of motor and mental functioning, and coma
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Merriam-Webster unabridged
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