Pyroboric
Pronunciation : Pyr`o*bo"ric
Part of Speech : a.
Etymology : [Pyro- + boric.] (Chem.)
Definition : Defn: Pertaining to derived from, or designating, an acid, H2B4O7 (called also tetraboric acid), which is the acid ingredient of ordinary borax, and is obtained by heating boric acid.
Source : Webster's Unabridged Dictionary, 1913