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 hæmatoglobulin.
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
hæmatocrystallin. See Blood crystal, under
Blood.