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Meaning of hemocyanin

he•mo•cy•a•nin

Pronunciation: (hē"mu-sī'u-nin, hem"u-), [key]
— n. Biochem.
  1. a blue, copper-containing respiratory pigment in the plasma of many invertebrates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.