borosilicate
- n a salt of boric and silicic acids
- In its great belly was a 34-ton lake of molten pyrex borosilicate glass, white hot at 1.
- Bodum 's new Manhattan line of double-walled borosilicate glasses look heavy but are actually quite light.
- Shrunk glass is made by mixing two borosilicate formulas, one of which is soluble in acid, the other not.