WordReference Random House Unabridged Dictionary of American English © 2017
an•ti•se•rum  (antə sēr′əm),USA pronunciation n., pl.  -se•rums, -se•ra 
    (-sēr′ə).USA pronunciation 
  1. Drugsa serum containing antibodies, as antitoxins or agglutinins, obtained by inoculation of animals and used for injection into other animals to provide immunity to a specific disease.
  • anti- + serum 1900–05

Collins Concise English Dictionary © HarperCollins Publishers::

antiserum /ˌæntɪˈsɪərəm/ n ( pl -rums, -ra / -rə/)
  1. blood serum containing antibodies against a specific antigen, used to treat or provide immunity to a disease

'antiserum' also found in these entries:

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