Definition of "heatproof" []

• Unaffected by heat. Used especially of plastic, glass, or ceramic utensils that may be used directly over a flame or in an oven. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Topping: Meanwhile, chop chocolate; in heatproof bowl over saucepan of hot (not boiling) water, melt chocolate with butter."
• "Transfer to a heatproof surface; let rest for 5 minutes."
• "In a small, heatproof bowl, melt butter and chocolate together."