Pyrex

Etymology
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, and in the interests of the letter "r" was inserted between pie and ex, and the whole thing condensed to pyrex."

Proper noun

 * 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.