Definition of potassium nitrate
: a crystalline salt KNO3 that occurs as a product of nitrification in arable soils, is a strong oxidizer, and is used especially in making gunpowder, as a fertilizer, and in medicine
First Known Use of potassium nitrate
Medical Definition of potassium nitrate
: a crystalline salt KNO3 that is a strong oxidizing agent and is used in medicine chiefly as a diuretic—called also niter, saltpeter
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