硝石
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う
せ
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Meanings
1
saltpeter; potassium nitrate; niter
Chemical term for potassium nitrate (KNO₃), historically used in gunpowder, fertilizers, and food preservation. The cross-reference to 硝酸カリウム indicates it is the same substance.
See also: 硝酸カリウム
Saltpeter has been used since ancient times as an ingredient in gunpowder.
Saltpeter is also called potassium nitrate.