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Collins Concise English Dictionary © HarperCollins Publishers:: saltpetre, US saltpeter /ˌsɔːltˈpiːtə/ n - another name for potassium nitrate
- short for Chile saltpetre
Etymology: 16th Century: from Old French salpetre, from Latin sal petrae salt of rock salt•pe•ter (sôlt′pē′tər),USA pronunciation n. - Chemistrythe form of potassium nitrate, KNO3, that occurs naturally, used in the manufacture of fireworks, fluxes, gunpowder, etc.;
niter. - ChemistrySee Chile saltpeter.
Also, salt′pe′tre. - Medieval Latin salpetrē, for Latin sal petrae salt of rock, so called because it commonly encrusts stones
- 1275–1325; earlier salt peter; replacing Middle English sal peter, salpetre
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