DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Hb
       n 1: 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:
            hemoglobin, haemoglobin, Hb]