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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