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Definition of Pyrex
1. Noun. A borosilicate glass with a low coefficient of expansion; used for heat-resistant glassware in cooking and chemistry.
Definition of Pyrex
1. Noun. A borosilicate glass with a low coefficient of thermal expansion; used for heat-resistant glassware in cooking and chemistry ¹
2. Noun. A kind of heat-resistant glass. ¹
¹ Source: wiktionary.com
Definition of Pyrex
1. borosilicate glass and glassware resistant to heat, chemicals, and electricity -- a trademark [n -ES]