from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Unaffected by heat. Used especially of plastic, glass, or ceramic utensils that may be used directly over a flame or in an oven.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. insulating and incombustible
- v. To make insulating and incombustible.
heat + -proof (Wiktionary)