'anathematiser' originates from English, specifically from the verb 'anathematise,' which itself comes from the Greek word 'anathematizein,' where 'anathema' meant 'a curse' and '-izein' meant 'to make or do.'

'anathematise' was formed in English from the Greek 'anathematizein,' and the agent noun suffix '-er' was added to create 'anathematiser.'

Initially, it meant 'one who pronounces a curse or excommunication,' and this meaning has remained consistent in modern usage.