serum [sir′əm]
pl. serums or sera [sir′ə] [L, whey < IE * serom, fluid < base * ser-, to flow > Sans sara-, fluid, Gr hormē, an attack]
a) a clear, watery animal fluid, as serous fluid
b) the clear, yellowish fluid of the blood which separates from a blood clot after coagulation and shrinkage: in full blood serum
2. blood serum containing agents of immunity, taken from an animal made immune to a specific disease by inoculation: it is used as an antitoxin and for diagnosis
3. the whey of milk
4. the thin, watery part of a plant fluid

English World dictionary. . 2014.

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