wikipedia
English
Etymology
First manufactured by the Corning Glasswear Factory in 1915. See quote below.
Proper noun
Pyrex & trade;
- a borosilicate glass with a low coefficient of expansion; used for heat-resistant glassware in cooking and chemistry
#*1957 Letter from the Corning Glasswear Factory. "We had a number of prior trademarks ending in the letters ex. One of the first commercial products to be sold under the new mark was a pie plate, and in the interests of euphonism the letter "r" was inserted between pie and ex, and the whole thing condensed to pyrex."
References
2005: Brewers Phrase and Fable 17th ed. (for etymology).
fr:Pyrex
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