saltpeter

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saltpeter (US) noun
or British saltpetre /ˈsɑːltˈpiːtə/
saltpeter (US)
noun
or British saltpetre /ˈsɑːltˈpiːtə/
Learner's definition of SALTPETER
[noncount]
: 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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