'refiner' originates from the verb 'refine,' which comes from the Old French word 'refiner,' where 're-' meant 'again' and 'fin' meant 'end' or 'finish.'

'refiner' evolved from the Old French 'refiner' and became the modern English word 'refiner.'

Initially, it meant 'to make something pure or better,' and this meaning has largely remained the same in modern usage.