'polyuria' originates from New Latin/medical formation combining Greek prefix 'poly-' meaning 'many' and Greek 'ouron' meaning 'urine'.

'polyuria' was formed in New Latin from the Greek elements 'poly-' + 'ouron' and entered modern medical English as the term 'polyuria'.

Initially formed to mean 'many (or excessive) urinations/urine,' and this core meaning has remained consistent in medical usage.