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 Chili,
whence it is known also as {Chili saltpeter}.
{Niter bush} (Bot.), a genus ({Nitraria}) of thorny shrubs
bearing edible berries, and growing in the saline plains
of Asia and Northern Africa.