pyrex

Genericization of the trademark Pyrex

pyrex (uncountable)

1. 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.

   Hypernyms: borosilicate glass, glass

   • 1993, George Samuel Schuyler with Robert A. Hill and R. Kent Rasmussen, Black Empire, page 53:

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

   • 2007, Jane Gardam, The Queen of the Tambourine:

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

   • 2010, Ross Macdonald, The Ferguson Affair:

     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.

2. (by extension) Any borosilicate glass
3. (by extension) Any glass capable of withstanding high temperatures, such as tempered glass suitable for cooking

• prexy

pyrex m (plural pyrex)

1. pyrex