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1. Oxford Dictionary

   myasthenia

   • IPA[ˌmʌɪəsˈθiːnɪə]

   英式

   • n.
     a condition causing abnormal weakness of certain muscles.；a rare chronic autoimmune disease marked by muscular weakness without atrophy, and caused by a defect in the action of acetylcholine at neuromuscular junctions.

   • noun: myasthenia, plural noun: myasthenia gravis

2. • 更多解釋

   myasthenia

   • IPA[ˌmīəsˈTHēnēə]

   美式

   • n.
     a condition causing abnormal weakness of certain muscles.

   Oxford American Dictionary