Etymology
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serum (n.)

1670s, "watery animal fluid," from Latin serum "watery fluid, whey," from PIE verbal stem *ser- "to run, flow" (source also of Greek oros "whey;" Sanskrit sarah "flowing, liquid," sarit "brook, river"). First applied 1893 to blood serum used in medical treatments.

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Definitions of serum

serum (n.)
an amber, watery fluid, rich in proteins, that separates out when blood coagulates;
Synonyms: blood serum
From wordnet.princeton.edu