The mineral form of calcium nitrate

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) A hydrated calcium nitrate mineral that forms as an efflorescence where manure contacts concrete or limestone in a dry environment, as in stables or caverns.

WordNet Word definitions in WordNet
n. the mineral form of calcium nitrate

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Nitrocalcite \Ni`tro*cal"cite\, n. [Nitro- + calcite.] (Min.) Nitrate of calcium, a substance having a grayish white color, occuring in efflorescences on old walls, and in limestone caves, especially where there exists decaying animal matter.