What is the technical term for a material that is highly resistant or insulated to fire? Such as Diamond, or Ceramics? I looked at various words already, such as Endothermic, but I'm fairly certain that is not related to the act of resisting, as it appears to be directed more towards the act of absorbing heat from the environment, such as a snowman melting. So what is the correct technical or pretentious-sounding term for a material which cannot be easily burned. I am looking for something a little bit more extravagant than "Fire-Retardant".

Usage Example:

"The snowman had been made with a new substance that made it highly resistant to both the sun, and fire, and so it was now ______, and would not melt."

"Diamond is _____, and so it is highly resistant to fire and heat."


3 Answers 3


The technical term in science and engineering is refractory: having a high melting temperature or otherwise being resistant to thermal degradation. Ceramics are almost defined by their refractory nature.

  • 1
    Yes, this term is often used to describe heat-resistant bricks. Dec 14, 2020 at 21:42
  • 2
    This is the correct and technically understood term. See Merriam Webster meaning 3.
    – Anton
    Dec 14, 2020 at 23:05
  • Yep, that's what I was looking for. Thank you.
    – Krythic
    Dec 15, 2020 at 0:17

A common term is "fireproof". (ref.)

1 resistant to destruction by fire.
2 totally or almost totally unburnable.


A friend of mine found an interesting one.

Salamandrine(adj) of, pertaining to, or resembling, a salamander; enduring fire.

  • 4
    So if you want to send your reader to a dictionary, use this one. :)
    – Barmar
    Dec 15, 2020 at 16:01
  • @Barmar Most, but probably not all readers. I’d actually expect many people who have an above-average knowledge of the insanity that were medieval concepts of zoology (such as salamanders being creatures of fire and flames) to be able to figure this one out in context. Dec 15, 2020 at 16:15
  • I suspect that a lot of people would guess this is referring to some sort of Mandarin.
    – Hot Licks
    Dec 15, 2020 at 18:44
  • 3
    @AustinHemmelgarn Ermm, how many people do you think have an above-average knowledge of medieval concepts of zoology? [Don't say 50%] Dec 15, 2020 at 23:06
  • @AzorAhai-him- There’s a reason that I specifically said ‘most, but probably not all’. I mean that most readers would need a dictionary, but many of the (admittedly small number of) people who have an above-average knowledge of medieval concepts of zoology would probably get it. Dec 16, 2020 at 1:41

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