borosilicate glass

WordReference Random House Unabridged Dictionary of American English © 2026

borosil′icate glass′, 

1. Ceramics a glass containing 5 percent or more of B₂O₃, highly resistant to heat and shock, used esp. in making cookware and chemical glassware.

• 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::

borosilicate glass noun

1. 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