Merriam-Webster Collegiate Dictionary - lymphocytic choriomeningitis

 noun  Etymology: New Latin choriomeningitis cerebral meningitis, from chorio- of a membrane resembling the chorion  Date: 1934 an acute disease that is caused by an arenavirus (species Lymphocytic choriomeningitis virus of the genus Arenavirus), that is characterized by fever, nausea and vomiting, headache, stiff neck, and slow pulse, that is marked by the presence of numerous lymphocytes in the cerebrospinal fluid, and that is transmitted especially by rodents