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   serum

   /ˈsɪərəm/

   noun

   • 1. an amber-coloured, protein-rich liquid which separates out when blood coagulates: "the researchers examined blood serum obtained from 471 men and women"
   • 2. the blood serum of an animal used to provide immunity to a pathogen or toxin by inoculation or as a diagnostic agent: "doctors treated the bites of carpet vipers with serum produced from local snakes"

   Word Origin late 17th century: from Latin, literally ‘whey’.

   Scrabble Points: 7

   • S

     1

   • E

     1

   • R

     1

   • U

     1

   • M

     3

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