myasthenia
/ˌmaɪəsˈθiːnɪə/noun
mass noun
1- a condition causing abnormal weakness of certain muscles肌无力,肌肉衰弱。
1.1
- （全称myasthenia gravis /ˈgrɑːvɪs /）a rare chronic autoimmune disease marked by muscular weakness without atrophy, and caused by a defect in the action of acetylcholine at neuromuscular junctions重症肌无力。
词源
mid 19th cent.: modern Latin, from Greek mus 'muscle' + ASTHENIA.