noun Date: 1947 a disorder of unknown cause that is characterized by persistent profound fatigue usually accompanied by other symptoms (as headache and tender lymph nodes) unrelated to any preexisting medical condition
CHRONIC FATIGUE SYNDROME
Meaning of CHRONIC FATIGUE SYNDROME in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012