1. (noun)potassium nitrate, saltpeter, saltpetre, niter, nitre (KNO3) used especially as a fertilizer and explosive
Definition of 'saltpetre'
Webster Dictionary
1. (noun)saltpetre potassium nitrate; niter; a white crystalline substance, KNO3, having a coolingsaline taste, obtained by leaching from certain soils in which it is produced by the process of nitrification (see Nitrification, 2). It is a strong oxidizer, is the chief constituent of gunpowder, and is also used as an antiseptic in curing meat, and in medicine as a diuretic, diaphoretic, and refrigerant
Definitions of saltpetre 
