What is the medical term meaning something that stimulates urination?

The medical term for something that stimulates urination is a Diuretic. Diuretics are a class of drugs that increase the rate of urine output. They are often used to treat conditions that cause fluid retention, such as congestive heart failure, cirrhosis, and kidney disease. Diuretics work by blocking the reabsorption of sodium and water in the kidneys, which causes more urine to be produced.