Pyrex pyrex • pyrexia · · · Info · Definitions · Characters · · Pyrex · · Text Latin · · Script 5 · · Length 2 · · Syllables Definitions · · · (noun) a borosilicate glass with a low coefficient of expansion; used for heat-resistant glassware in cooking and chemistry. · · Noun Definition 1 Characters · · P latin capital letter p U+0050 e latin small letter e U+0065 r latin small letter r U+0072 x latin small letter x U+0078 y latin small letter y U+0079