Bilirubin

a reddish bile pigment, C 33 H 36 O 6 N 4 , resulting from the degradation of heme by reticuloendothelial cells in the liver: a high level in the blood produces the yellow skin symptomatic of jaundice.
Historical Examples

A System of Practical Medicine By American Authors, Vol. II Various
A System of Practical Medicine By American Authors, Vol. II Various
A Manual of Clinical Diagnosis James Campbell Todd
A System of Practical Medicine By American Authors, Vol. II Various

noun
an orange-yellow pigment in the bile formed as a breakdown product of haemoglobin. Excess amounts in the blood produce the yellow appearance associated with jaundice. Formula: C32H36O6N4
n.
bilirubin
(bĭl’ĭ-r’bĭn)
A reddish-yellow pigment that is a constituent of bile and gives it its color. Bilirubin is a porphyrin derived from the degradation of heme. It is often a constituent of gallstones, and also causes the skin discoloration seen in jaundice. Chemical formula: C33H36N4O6.