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hemocyanin

[hee-muh-sahy-uh-nin, hem-uh-]

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noun Biochemistry.

a blue, copper-containing respiratory pigment in the plasma of many invertebrates.

Origin:
1835–45; hemo- + cyan-¹ + -in²

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hemocyanin is always a great word to know.

So is lithium. Does it mean:

Symbol: Li; atomic weight: 6.939; atomic number: 3

Symbol: Nb; atomic weight: 92.906; atomic number: 41

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Collins

World English Dictionary

haemocyanin or (US) hemocyanin (ˌhiːməʊˈsaɪənɪn)

—n
	a blue copper-containing respiratory pigment in crustaceans and molluscs that functions as haemoglobin

hemocyanin or (US) hemocyanin

—n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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hemocyanin

he·mo·cy·a·nin