Bible Dictionaries
Pyroboric
Webster's Dictionary
(a.) 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.
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Bibliography Information
Webster, Noah. Entry for 'Pyroboric'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/pyroboric.html. 1828.