Main Entry: pan·en·ceph·a·li·tis Pronunciation: "pan-in-"sef-&-'lIt-&s Function: noun Inflected Form: pluralpan·en·ceph·a·lit·i·des/-'lit-&-"dEz/ : inflammation of the brain affecting both white and gray matter —see SUBACUTE SCLEROSING PANENCEPHALITIS
panencephalitis pan·en·ceph·a·li·tis (pān'ěn-sěf'ə-lī'tĭs) n. Encephalitis that affects both the gray and white matter of the brain, resulting in progressive loss of mental and motor functions.