globin

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The protein constituent of hemoglobin and myoglobin.

from The Century Dictionary.

• noun The proteid substance which with hematin makes up the larger part of the red blood-corpuscles. It is possibly a mixture of several distinct proteids.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Biochem.) a colorless protein obtained by removing heme from hemoglobin; the protein part of hemoglobin.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry One of several polypeptides that are the protein components of haemoglobin in blood.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a colorless protein obtained by removing heme from hemoglobin; the oxygen carrying compound in red blood cells