Definition: yellowish brown pigment that is formed by the breaking down of old or damaged red blood cells. An accumulation of bilirubin in the blood is called "jaundice," which indicates medical problems involving the liver, bile ducts and possibly the pancreas.
Bilirubin
By Lisa Fayed, About.com Guide
Updated January 13, 2009
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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