기면성 뇌염의 옛 명칭으로, 심한 졸음과 무기력증을 동반하는 전염성 뇌 질환.
A historical term for encephalitis lethargica, an epidemic form of encephalitis characterized by extreme lethargy and prolonged sleep.
예문:
"During the late 19th century, many patients were diagnosed with nona during the influenza epidemic."
"The medical journal described nona as a mysterious condition where victims could sleep for days."