myasthenia gra·vis /-ˈgrævəs, ˈgrɑ-/
  myasthenia gra·vis /-ˈgrævəs, ˈgrɑv-/ 名詞
  重症肌無力,假痲痺性重症肌無力,重症肌無力症
  myasthenia gravis
       n : a chronic progressive disease characterized by chronic
           fatigue and muscular weakness (especially in the face and
           neck); caused by a deficiency of acetylcholine at the
           neuromuscular junctions [syn: myasthenia]