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Noun: intumescence  ,in-too'me-sun(t)s or ,in-tyû'me-sun(t)s [N. Amer], ,in-tyû'me-sun(t)s [Brit]
  1. Swelling up with blood or other fluids (as with congestion)
    - intumescency
     
  2. The increase in volume of certain substances when they are heated (often accompanied by release of water)
    - intumescency, swelling

Derived forms: intumescences

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