noun (n)

• swelling up with blood or other fluids (as with congestion)(noun.state)

  Synonym:
  intumescency
  

  source: wordnet30
• the increase in volume of certain substances when they are heated (often accompanied by release of water)(noun.process)

  Synonym:
  intumescency, swelling
  

  source: wordnet30
• The act or process of swelling or enlarging; also, the state of being swollen; expansion; tumidity; especially, the swelling up of bodies under the action of heat.(noun)

  source: webster1913