pyrex

name

1. A brand of glassware produced by the Corning corporation, capable of resisting high temperatures, and suitable for cooking applications, currently made with tempered glass.
2. (historical)A brand of glassware produced by Corning using borosilicate glass.

noun

1. (alt-of, alternative, uncountable)Alternative form of pyrex.
2. (uncountable)A kind of heat-resistant borosilicate glass, made by mixing a high concentration of boron oxides into the molten glass to reduce its thermal expansion coefficient.

   “This steel tube slips into the pyrex glass focus tube, which is jacketed by a vacuum”

   “There is half of a yesteryear's tin of baked beans in a pyrex bowl”

   “I tiptoed into the kitchen, turned on the fluorescent light over the stove, and peered into the oven. It was still warm, though the gas had been turned off. My dinner was there, in a pyrex dish with a cover.”

3. (broadly, uncountable)Any borosilicate glass.
4. (broadly, uncountable)Any glass capable of withstanding high temperatures, such as tempered glass suitable for cooking.