a colorless crystalline compound, B 2 O 3 , used in metallurgy and chemical analysis.
noun any aromatic rutaceous shrub of the Australian genus Boronia Historical Examples Captivity M. Leonora Eyles Peeps At Many Lands: Australia Frank Fox Australian Pictures Howard Willoughby Journal of an Overland Expedition in Australia Ludwig Leichhardt
a salt of boric and silicic acids. noun a salt of boric and silicic acids
a glass containing 5 percent or more of B 2 O 3 , highly resistant to heat and shock, used especially in making cookware and chemical glassware. noun any of a range of heat- and chemical-resistant glasses, such as Pyrex, prepared by fusing together boron(III) oxide, silicon dioxide, and, usually, a metal oxide
any of several hypothetical acids that form borosilicates.