Ni·ter, Ni·tre  n.
  1. Chem. A white crystalline semitransparent salt; potassium nitrate; saltpeter. See Saltpeter.
  2. Chem. Native sodium carbonate; natron. [Obs.]
     For though thou wash thee with niter, and take thee much soap, yet thine iniquity is marked before me.   --Jer. ii. 22.
  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.
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