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Webster's 1913 Dictionary

NITRUM

Ni "trum, n. Etym: [L., natron. See Niter. ] (Old Chem. )

 

Defn: Niter. Nitrum flammans Etym: [L., flaming niter ] (Old Chem. ), ammonium nitrate; -- probably so called because it deflagerates when suddenly heated.