Nitrocalcite
Pronunciation : Ni`tro*cal"cite
Part of Speech : n.
Etymology : [Nitro- + calcite.] (Min.)
Definition : Defn: Nitrate of calcium, a substance having a grayish white color, occuring in efforescences on old walls, and in limestone caves, especially where there exists decaying animal matter.
Source : Webster's Unabridged Dictionary, 1913