serum - definition and synonyms

noun medical 

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/ˈsɪərəm/
singularserum
pluralserums or sera
  1. 1
    [countable/uncountable] a liquid that is put into someone’s blood to help them to fight an infection or a poison
  2. 2
    [uncountable] the thin yellow liquid that is part of blood and that separates from it when it clots (=becomes thick and hard)