‖Ni″trum (?), n. [L., natron. See Niter.] (Old Chem.) Niter.
‖Nitrum flammans(Old Chem.), ammonium nitrate; — probably so called because it deflagrates when suddenly heated.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.