in·​tu·​mes·​cent ˌin-tü-ˈme-sᵊnt How to pronounce intumescent (audio)
of paint
: swelling and charring when exposed to flame

Word History

First Known Use

1953, in the meaning defined above

Time Traveler
The first known use of intumescent was in 1953

Dictionary Entries Near intumescent

Cite this Entry

“Intumescent.” Dictionary, Merriam-Webster, Accessed 29 Feb. 2024.

Medical Definition


in·​tu·​mes·​cent -ᵊnt How to pronounce intumescent (audio)
: marked by intumescence
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!