Definitions

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.

Etymologies

heat +‎ -proof (Wiktionary)

Examples

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