nitre, n. [F. nitre, L. nitrum native soda, natron, Gr. ; cf. Ar. nit, natr natron. Cf. Natron.].
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.