GNU Collaborative International Dictionary of English

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1.       
   { Niter, Nitre  } , n. [F. nitre, L. nitrum native soda, natron, Gr. ; cf. Ar. nitūn, natrūn natron.  Cf. Natron.]
   (Chem.) A white crystalline semitransparent salt; potassium nitrate; saltpeter. See Saltpeter.
   1913 Webster
   (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