Swelling can mean:

Look up swell in Wiktionary, the free dictionary.

• In medicine:
  • Swelling (medical) is the enlargement of organs caused by accumulation of excess fluid in tissues, called edema.
• In engineering:
  • Increase of volume of material, due to absorption of a solvent (common for plastic polymers)
  • Neutron-induced swelling caused by neutron radiation.

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