'allopath' originates from Greek, specifically the word 'allopathēs,' where 'allo-' meant 'other' and 'pathos' meant 'suffering.'

'allopathēs' transformed into the German word 'allopath,' and eventually became the modern English word 'allopath.'

Initially, it meant 'one who treats disease with remedies producing effects different from those of the disease,' and this meaning has largely remained the same in modern usage.