2 definitions found From 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] From The Collaborative International Dictionary of English v.0.48 [gcide]: 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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