Nitrum \Ni"trum\, n. [L., natron. See Niter.]
(Old Chem.)
Niter.
Nitrum flammans [L., flaming niter] (Old Chem.), ammonium
nitrate; -- probably so called because it deflagerates
when suddenly heated.
Source: Webster's Revised Unabridged Dictionary (1913)
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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.
Source: Webster's Revised Unabridged Dictionary (1913)
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