What does saltpetre mean?
Saltpetre is another name for potassium nitrate, a white crystalline chemical compound best known historically as a key ingredient in gunpowder. It is also used in fireworks, where it provides an oxidizing component, and in fertilizers and other industrial applications. The word has a strongly historical and technical character: it evokes early chemistry, mining, saltpetre works, and the manufacture of gunpowder. In British English, "saltpetre" is the usual spelling, while American speakers generally prefer "saltpeter." The alternative term "nitre" is also established, particularly in British usage. Although saltpetre is often discussed in connection with weapons and explosives, it is not itself an explosive; it becomes part of gunpowder when combined with charcoal and sulfur, and it is also useful in fireworks and agriculture.
nounSaltpetre is potassium nitrate, a white crystalline salt historically used in gunpowder and also used in fireworks, fertilizers, and various industrial processes.
- The chemical compound potassium nitrate, a white crystalline salt used in gunpowder, fireworks, fertilizers, and industrial processes.
"The gunpowder maker carefully ground the saltpetre before combining it with charcoal and sulfur."
"Saltpetre is one of the principal ingredients in traditional gunpowder."
"The factory tested samples of saltpetre for purity before using them in fireworks."
Rare; saltpetre is normally used as an uncountable mass noun.
"The museum displays several historical samples of saltpetres from European mines."
Saltpetre was once so important for making gunpowder that some countries controlled its production like a strategic resource.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does saltpetre come from?
The word dates from the early 16th century and comes through Anglo-French from Latin sal petrae, literally "salt of the rock." Latin sal is the source of related words such as "salary" and "saline," while petra is a Latin borrowing of Greek petra, "rock," also underlying words such as "petrify." The compound originally referred to naturally occurring nitrate deposits associated with rock salt and other mineral sources.
How saltpetre is actually used
The term is somewhat formal or historical in modern English. British English commonly uses "saltpetre," whereas American English more often uses "saltpeter"; "nitre" is also encountered, especially in British and technical contexts.
Easily confused with saltpetre
Saltpetre and saltpeter are spelling variants for the same substance, with saltpeter more common in American English and saltpetre more common in British English.