'bladder' originates from Old English, specifically the word 'blǣdre,' where 'blǣd' meant 'blow' or 'blast.'

'blǣdre' transformed into the Middle English word 'bladdre,' and eventually became the modern English word 'bladder.'

Initially, it meant 'a swelling or blister,' but over time it evolved into its current meaning of 'a sac for storing urine.'