1) Animal pigment 2) Bilirubin 3) Hematoidin 1) Bilirubin 2) Hematoidin 
• (n.) Same as Hematoidin.
<haematology> A substance which appears to be identical to the red-orange bile pigment bilirubin, but which is produced from haemoglobin in tissues rather than within the liver and usually when oxygen tension is low. ... (09 Oct 1997) ...