'indigestion' originates from Latin, specifically the word 'indigestio', where 'in-' meant 'not' and 'digestio' meant 'digestion'.

'indigestio' transformed into the Old French word 'indigestion', and eventually became the modern English word 'indigestion'.

Initially, it meant 'lack of digestion', but over time it evolved into its current meaning of 'difficulty in digesting food'.