'amyosthenia' originates from Greek, specifically the word 'amyosthenia,' where 'a-' meant 'without,' 'myo-' referred to 'muscle,' and 'sthenia' meant 'strength.'

'amyosthenia' has remained relatively unchanged from its Greek origins, maintaining its meaning related to muscle weakness.

Initially, it meant 'without muscle strength,' and this meaning has largely remained the same in modern usage.