慢まん性せい疲ひ労ろう症しょう候こう群ぐんまんせいひろうしょうこうぐんMeanings1nounchronic fatigue syndrome; CFSmedicine›Medical term for a complex disorder characterized by extreme fatigue that doesn't improve with rest.慢まん性せい疲ひ労ろう症しょう候こう群ぐんは