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Noun: intumescency
  1. Swelling up with blood or other fluids (as with congestion)
    - intumescence
     
  2. The increase in volume of certain substances when they are heated (often accompanied by release of water)
    - intumescence, swelling

See also: intumesce, intumescent

Type of: chemical action, chemical change, chemical process, lump, puffiness, swelling