Source : Webster's Revised Unabridged Dictionary (1913)

Hematoidin \Hem`a*toid"in\, n. (Physiol. Chem.)
   A crystalline or amorphous pigment, free from iron, formed
   from hematin in old blood stains, and in old hemorrhages in
   the body. It resembles bilirubin. When present in the corpora
   lutea it is called {h[ae]molutein}.

Source : WordNet®

hematoidin
     n : an orange-yellow pigment in the bile that forms as a product
         of hemoglobin; excess amounts in the blood produce the
         yellow appearance observed in jaundice [syn: {bilirubin},
          {haematoidin}]