Haemacyanin
Pronunciation : H?m`a*cy"a*nin
Part of Speech : n.
Etymology : [H?ma- + Gr. (Physiol. Chem.)
Definition : Defn: A substance found in the blood of the octopus, which gives to it its blue color.
Note: When deprived of oxygen it is colorless, but becomes quickly blue in contact with oxygen, and is then generally called oxyh?macyanin. A similar blue coloring matter has been detected in small quantity in the blood of other animals and in the bile.
Source : Webster's Unabridged Dictionary, 1913