Medical Definition of angiosperm. : any of a class (Angiospermae) of vascular plants (as orchids or roses) that have the seeds in a closed ovary and include the monocotyledons and dicotyledonsâcompare gymnosperm.
Bilirubin (formerly referred to as haematoidin) is the yellow breakdown product of normal heme catabolism, caused by the body's clearance of aged red blood cells which contain hemoglobin. Bilirubin is excreted in bile and urine, and elevated levels may indicate certain diseases.
Bilirubin is a yellowish pigment found in bile, a fluid made by the liver. This article discusses the laboratory test that is done to measure bilirubin in the blood. A small amount of older red blood cells are replaced by new blood cells every day. Bilirubin is left after these older blood cells are removed.