They block the reabsorption of sodium in the kidneys

• Any of a group of drugs commonly used as diuretics in the treatment of hypertension

Wiktionary Word definitions in Wiktionary
n. Any of a class of diuretic drugs based on a ''benzothiadiazine sulfonamide dioxide''

WordNet Word definitions in WordNet
n. any of a group of drugs commonly used as diuretics in the treatment of hypertension; they block the reabsorption of sodium in the kidneys

Wikipedia Word definitions in Wikipedia
Thiazide is a type of molecule and a class of diuretics often used to treat hypertension (high blood pressure) and edema (such as that caused by heart, liver, or kidney disease). The thiazides and thiazide-like diuretics reduce the risk of death, stroke, ...