noun
potassium nitrate; saltpeter
Chemical compound KNO₃; used in fertilizers, food preservation, and historically in gunpowder.
硝酸カリウムは火薬の原料として使われる。
Potassium nitrate is used as an ingredient in gunpowder.
食品添加物として硝酸
Potassium nitrate is sometimes included as a food additive.