Source : Webster's Revised Unabridged Dictionary (1913)

Hematin \Hem"a*tin\, n. [Gr. a"i^ma, a"i`matos, blood.]
   1. Hematoxylin.

   2. (Physiol. Chem.) A bluish black, amorphous substance
      containing iron and obtained from blood. It exists the red
      blood corpuscles united with globulin, and the form of
      hemoglobin or oxyhemoglobin gives to the blood its red
      color.

Source : WordNet®

hematin
     n : a complex red organic pigment containing iron and other
         atoms to which oxygen binds [syn: {heme}, {haem}, {haemitin},
          {protoheme}]