Nitrum

• (n.) Niter. • (n.) Niter.
Found on http://thinkexist.com/dictionary/meaning/nitrum/

Nitrum

Ni'trum noun [ Latin , natron. See Niter .] (Old Chem.) Niter. - - Nitrum flammans [ Latin , flaming niter] (Old Chem.) , ammonium nitrate; -- probably so called because it deflagerates when suddenly heated.
Found on http://www.encyclo.co.uk/webster/N/25
No exact match found