Recent Examples of saltpeter from the Web
Historically, the best natural source of saltpeter, the common name for potassium nitrate, has been from caves caked with bat droppings.
That offshoot nation traded farmland for huge amounts of saltpeter.
Guano was used for fertilizer, and for saltpeter for making gunpowder.
Potash was also an important ingredient in saltpeter, which was in turn an ingredient in gunpowder–
Well, consider the scene where John Adams sings an explanation of the recipe for saltpeter to Abigail, to convince her to rally her friends to make some for the Continental Army.
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SALTPETER Defined for English Language Learners
Definition of saltpeter for English Language Learners
: a white powder that exists naturally in some soils and that is used especially as a fertilizer, in medicine, and to make gunpowder
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