# Pyrex

> English word · Proper noun · frequency rank #52,577

## Definitions
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. A brand of glassware produced by Corning using borosilicate glass.

## Etymology
From 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."
* The name also connotes the fire of pyro-.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/pyrex