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1. The Collaborative International Dictionary of English v.0.48
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]
2. The Collaborative International Dictionary of English v.0.48
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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