Definition of intumescent in English:

intumescent

adjective

  • (of a coating or sealant) swelling up when heated, thus protecting the material underneath or sealing a gap in the event of a fire.

    ‘intumescent fire-retardant paints’
    • ‘Columns of the arcade are simply the rolled steel members of the frame, exposed and made silver with intumescent paint.’
    • ‘If alternative panels cannot be used then the ends of the sandwich panels must be sealed and locked together in a non-combustible wall intumescent seal.’

Pronunciation:

intumescent

/ˌint(y)o͞oˈmes(ə)nt/