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Wordnet 3.0

NOUN (1)

1. (KNO3) used especially as a fertilizer and explosive;
[syn: potassium nitrate, saltpeter, saltpetre, niter, nitre]

The Collaborative International Dictionary of English v.0.48:

Niter \Ni"ter\, Nitre \Ni"tre\, n. [F. nitre, L. nitrum native soda, natron, Gr. ?; cf. Ar. nit[=u]n, natr[=u]n natron. Cf. Natron.] 1. (Chem.) A white crystalline semitransparent salt; potassium nitrate; saltpeter. See Saltpeter. [1913 Webster] 2. (Chem.) Native sodium carbonate; natron. [Obs.] [1913 Webster] For though thou wash thee with niter, and take thee much soap, yet thine iniquity is marked before me. --Jer. ii. 22. [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. [1913 Webster]