As a Noun: 1. A DIURETIC is a substance which makes your body increase its production of waste fluids, with the result that you need to urinate more often than usual. Note: 1. There appears to be no commonly used Auslan sign for DIURETIC. If you know a sign for DIURETIC used by you or other Auslan users (deaf people or interpreters) please go to "missing sign feedback" and supply details. Thank you.