Also, especially British, nitre.

1375–1425; late Middle English nitre < Latin nitrum < Greek nítron natron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
niter (ˈnaɪtə)
the usual US spelling of nitre

nitre or (US) niter (ˈnaɪtə)
potassium nitrate another name for sodium nitrate
[C14: via Old French from Latin nitrum, from Greek nitronnatron]
niter or (US) niter
[C14: via Old French from Latin nitrum, from Greek nitronnatron]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
niter   (nī'tər)  Pronunciation Key 
A naturally occurring mineral form of potassium nitrate. It is used to make gunpowder.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Selenium is recovered by roasting the mud with soda or sulfuric acid, or by smelting them with soda and niter.
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