noun
encephalitis lethargica
Medical term for a specific form of encephalitis characterized by lethargy; also known as von Economo disease or sleeping sickness.
嗜眠性脳炎は、1910年代から1920年代にかけて世界的に流行した。
Encephalitis lethargica spread worldwide from the 1910s to the 1920s.
Compound of 嗜眠 (shimin, 'lethargy, drowsiness') + 性 (-sei, '-ic, -like') + 脳炎 (nōen, 'encephalitis'). The term is a direct calque of the English 'encephalitis lethargica'.