Bilirubin Definition

bĭlĭ-ro͝obĭn, bĭlĭ-ro͝o-
The yellowish-red chief pigment, C33H36N4O6, of human bile, derived from biliverdin and found in small quantities in blood and urine: high concentrations change the color of blood and urine and result in jaundice.
Webster's New World
A reddish-yellow bile pigment, C33 H36 N4 O6 , derived from the degradation of heme.
American Heritage Medicine

(biochemistry) A bile pigment that is product of the breakdown of the heme portion of hemoglobin (which occurs within macrophages as they digest red blood cells), extremely high levels of which cause jaundice.


Origin of Bilirubin

  • Latin bīlis bile ruber red reudh- in Indo-European roots –in

    From American Heritage Dictionary of the English Language, 5th Edition

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