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"Serum (1) the continuous phase of a biocolloid after the solid or disperse phase has been removed by centrifugation, coagulation or similar means. In the case of milk, for example, the erum or whey is a true solution of sugars, proteins and mineral compounds in water.
(2) Specifically blood from which corpuscles, platelets, etc., have been removed, especially when prepared with antigenic bacteria for inoculation to effect the cure of a disease."

Butterworths Medical Dictionary, Second Edition defines Serum as :