Pyrex

First manufactured by the Corning Glasswear Factory in 1915.

• 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."

Pyrex (uncountable)

1. A borosilicate glass with a low coefficient of thermal expansion; used for heat-resistant glassware in cooking and chemistry

• 2005, Brewers Phrase and Fable, 17th ed. (for etymology)

• prexy