Pyrex

pie +‎ r +‎ -ex First manufactured by the Corning Glassware Factory in 1915.

• 1957, Letter from the Corning Glassware 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

1. A brand of glassware produced by the Corning corporation, capable of resisting high temperatures, and suitable for cooking applications, currently made with tempered glass.
2. (historical) A brand of glassware produced by Corning using borosilicate glass.

Pyrex (uncountable)

1. Alternative form of pyrex

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

• prexy