One of the mysteries of the English language finally explained.
1Situated behind or beyond the kidney.
2Occurring or existing in the urine after it leaves the kidney; designating, relating to, or suffering from a disorder, especially kidney failure, resulting from processes which occur in the urinary tract, or which prevent the excretion of urine after its formation.
1920s; earliest use found in Philosophical Transactions of the Royal Society of London. From post- + renal.
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