Niter

n.
  1. (Chem.) A white crystalline semitransparent salt; potassium nitrate; saltpeter. See Saltpeter.
  2. (Chem.) Native sodium carbonate; natron.
    3. 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.