A white crystalline semitransparent salt; potassium nitrate; saltpeter. See Saltpeter. [1913 Webster]

Native sodium carbonate; natron. [1913 Webster]
"For though thou wash thee with niter, and take thee much soap, yet thine iniquity is marked before me." [1913 Webster]

Cubic niter, a deliquescent salt, sodium nitrate, found as a native incrustation, like niter, in Peru and Chile, whence it is known also as Chile saltpeter. -- Niter bush (Bot.), a genus (Nitraria) of thorny shrubs bearing edible berries, and growing in the saline plains of Asia and Northern Africa.

Nitre, n.

See Niter. [1913 Webster]

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OXFORD DICTIONARY

Nitre, n. (US niter) saltpetre, potassium nitrate.

Etymology

ME f. OF f. L nitrum f. Gk nitron, of Semitic orig.

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