Myasthenia

1 definition found

From WordNet (r) 2.0 [wn]:

  myasthenia
       n 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 [syn: {myasthenia gravis}]
       2: any muscular weakness