In chemistry, containing or composed of two boron atoms or groups; a compound with bivalent boron units.
From bi- (two) + borate (a salt or compound containing boron), following systematic chemical nomenclature. The term emerged in 19th-century chemistry to describe complex boron compounds.
Chemical nomenclature uses 'bi-' to mean 'containing two,' so a biborate is like saying 'double-borate'—it's the kind of precise language that lets chemists describe incredibly specific molecular structures in one word.
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