any compound containing the nitrate group (such as a salt or ester of nitric acid)

any substance such as manure or a mixture of nitrates used to make soil more fertile

a simple form of gunpowder, consisting of a mixture of saltpeter, charcoal, and sulfur; invented in the 9th century in China.

any substance such as manure or a mixture of nitrates used to make soil more fertile

a simple form of gunpowder, consisting of a mixture of saltpeter, charcoal, and sulfur; invented in the 9th century in China.