Medical Dictionary


noun se·rum \ˈsir-əm\
plural se·ra \-ə\ or serums

Medical Definition of SERUM

:  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)
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