Source : Webster's Revised Unabridged Dictionary (1913)

Hemoglobin \Hem"o*glo"bin\, n. [Hemo- + globe.] (Physiol.)
   The normal coloring matter of the red blood corpuscles of
   vertebrate animals. It is composed of hematin and globulin,
   and is also called {h[ae]matoglobulin}. In arterial blood, it
   is always combined with oxygen, and is then called
   {oxyhemoglobin}. It crystallizes under different forms from
   different animals, and when crystallized, is called
   {h[ae]matocrystallin}. See {Blood crystal}, under {Blood}.

Source : WordNet®

hemoglobin
     n : a hemoprotein composed of globin and heme that gives red
         blood cells their characteristic color; function
         primarily to transport oxygen from the lungs to the body
         tissues; "fish have simpler hemoglobin than mammals"
         [syn: {haemoglobin}, {Hb}]