The Collaborative International Dictionary of English v.0.48:

Haematoidin \H[ae]m`a*toid"in\, n.
   Same as Hematoidin.
   [1913 Webster]

WordNet (r) 3.0 (2006):

haematoidin
    n 1: 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, hematoidin, haematoidin]