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Webster's 1913 Dictionary

PYROBORIC

Pyr `o *bo "ric, a. Etym: [Pyro- + boric. ] (Chem. )

 

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.