IPA: //maɪəˈsθiːniə//
KK: /maɪəˈsθiːniə/
A condition characterized by abnormal weakness or fatigue of the muscles, often due to a problem with the communication between nerves and muscles.
Myasthenia can cause severe muscle weakness, making everyday tasks difficult.
Myasthenia is formed from "myo-" (from Greek "musculus", meaning muscle) and "asthenia" (from Greek "astheneia", meaning weakness). The word refers to a condition characterized by muscle weakness.
Think of 'muscle' ('myo-') and 'weakness' ('asthenia') to remember that myasthenia means a condition of muscle weakness.