Look up saltpeter in Wiktionary, the free dictionary.
Saltpeter (or saltpetre) is the mineral form of potassium nitrate (KNO3), a compound
It may also sometimes refer to:
- Sodium nitrate (NaNO3), a compound
- Chile saltpeter or nitratine, the mineral form
- Norwegian saltpeter or calcium nitrate (Ca(NO3)2)
- Magnesium nitrate (Mg(NO3)2)