'prognosticator' originates from Latin, specifically the word 'prognosticātor', where 'pro-' meant 'before' and 'gnoscere' meant 'to know'.

'prognosticātor' transformed into the Old French word 'prognostiqueur', and eventually became the modern English word 'prognosticator'.

Initially, it meant 'one who knows beforehand', but over time it evolved into its current meaning of 'a person who predicts future events'.