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

'amyosthenia' transformed into the modern English word 'amyosthenic' to describe conditions related to muscle weakness.

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