[hee-muh-sahy-uh-nin, hem-uh-]
noun Biochemistry.
a blue, copper-containing respiratory pigment in the plasma of many invertebrates.

1835–45; hemo- + cyan-1 + -in2

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World English Dictionary
haemocyanin or (US) hemocyanin (ˌhiːməʊˈsaɪənɪn)
a blue copper-containing respiratory pigment in crustaceans and molluscs that functions as haemoglobin
hemocyanin or (US) hemocyanin

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for hemocyanin
Hemocyanin is colourless when deoxygenated and dark blue when oxygenated.
This is due to change in color of hemocyanin when is it oxidized.
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