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Definition of serum:

  1. A thin watery fluid, containing more or less albumin, secreted by the serous membranes of the body, such as the pericardium and peritoneum.
  2. The watery portion of certain animal fluids, as blood, milk, etc.

Synonyms:

agglutinoid, antiserum, agglutinogen, agglutinin, immunotoxin, blood serum, plasma.

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