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The Collaborative International Dictionary of English v.0.48 (gcide)

Nitrum \Ni"trum\, n. [L., natron. See {Niter}.] (Old Chem.)
Niter.
[1913 Webster]

{Nitrum flammans} [L., flaming niter] (Old Chem.), ammonium
nitrate; -- probably so called because it deflagrates when
suddenly heated.
[1913 Webster]


Trona \Tro"na\, n. [Of Egyptian or North African origin.] (Chem.
& Min.)
A native double salt, consisting of a combination of neutral
and acid sodium carbonate, {Na2CO3.2HNaCO3.2H2O}, occurring
as a white crystalline fibrous deposit from certain soda
brine springs and lakes; -- called also {urao}, and by the
ancients {nitrum}.
[1913 Webster]

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