n, pl  serums  or  se*ra   :  the watery portion of an animal fluid remaining after coagulation:  a (1) :  the clear yellowish fluid that remains from blood plasma after fibrinogen, prothrombin, and other clotting factors have been removed by clot formation - called also blood serum  (2) :  ANTISERUM  b  :  a normal or pathological serous fluid (as in a blister)
adj :  occurring or found in the serum of the blood < cholesterol>  < glutamic-oxaloacetic transminase>  .
 
 
 
Similar sounding terms:  ce·ri·um 
 
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