heavy chain

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heavy chain

n.
Either of the two larger polypeptide chains in an immunoglobulin molecule, consisting of a variable region that contains the antigen-binding portion and a constant region that is specific to each immunoglobulin class or subclass.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

heavy chain

n
(Medicine) immunol a type of polypeptide chain present in an immunoglobulin molecule
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014