Bilirubin

**Semantic type:** Biologically Active Substance

**Definition:** A dark orange, yellow pigment that is the product of the breakdown of iron in the blood; it is conjugated in the liver and excreted in the bile.

**Synonyms:** - BILIRUBIN - BILIRUBIN - Indirect Bilirubin - Indirect Bilirubin - Unconjugated Bilirubin - bilirubin