[mass noun]a highly contagious viral infection of the respiratory passages causing fever, severe aching, and catarrh, and often occurring in epidemics 流行性感冒
派生 influenzal adjective 语源
mid 18th cent.: from Italian, literally influence', from medieval Latin influentia (see influence). The Italian word also has the sense 'an outbreak of an epidemic', hence 'epidemic'. It was applied specifically to an influenza epidemic which began in Italy in 1743, later adopted in English as the name of the disease