intumescent
UK /ɪntjʊˈmɛsənt/ US /ɪntuˈmɛsənt/
adj 1noun 1
Definitions
adj
1
That becomes swollen, especially upon exposure to heat.
noun
1
Any substance that swells on exposure to heat, thus increasing in volume and decreasing in density.
Intumescents are used in some fire protection systems.
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