Real Dictionary

serum
a protein hormone, secreted in the pancreas by the islets of Langerhans, that controls the concentration of glucose in the blood. Insulin deficiency results in diabetes mellitus [...]
a white crystalline monosaccharide sugar that has several optically active forms, the most abundant being dextrose: a major energy source in metabolism. Formula: C6H12O6 [...]
an anhydride of creatine that is abundant in muscle and excreted in the urine [...]
any of a large group of nitrogenous compounds of high molecular weight that are essential constituents of all living organisms. They consist of one or more chains of amino acids linked by peptide bonds and are folded into a specific three-dimensional shap
intense mental application; complete attention [...]
the act or an instance of starving or state of being starved [...]
uncountable noun: Serum is the watery, pale yellow part of blood.
variable noun: A serum is a liquid that is injected into someone's blood to protect them against a poison or disease.