'polydipsia' originates from Greek, specifically the word 'poludipsios,' where 'poly-' meant 'many' and 'dipsa' meant 'thirst.'

'poludipsios' transformed into the Latin word 'polydipsia,' and eventually became the modern English word 'polydipsia.'

Initially, it meant 'many thirsts,' but over time it evolved into its current meaning of 'abnormally great thirst as a symptom of disease.'