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Noun
potassium nitrate
saltpeter
saltpetre
niter
nitre
Definition: (KNO3) used especially as a fertilizer and explosive
Definition: KNO₃, a naturally occurring salt, notably used as an ingredient of gunpowder; also used a food preservative and as an ingredient in toothpaste for sensitive gums; historically used in the production of nitric acid (HNO₃).