myasthenia

英 [,maɪəs'θiːnɪə] 美[,maɪəs'θinɪə]

• n. [内科] 肌无力（形容词myasthenic）；肌肉衰弱

1. 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

2. any muscular weakness