The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Oxyhaemoglobin \Ox`y*haem`o*glo"bin\, Oxyhemoglobin
\Ox`y*hem`o*glo"bin\, n. [Oxy
   (a) + haemoglobin, hemoglobin.] (Physiol. Chem.) See
       Hemoglobin.
       [1913 Webster]

WordNet (r) 3.0 (2006):

oxyhemoglobin
    n 1: the bright red hemoglobin that is a combination of
         hemoglobin and oxygen from the lungs; "oxyhemoglobin
         transports oxygen to the cells of the body" [syn:
         oxyhemoglobin, oxyhaemoglobin]