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[im-yuh-noh-glob-yuh-lin, ih-myoo-] /ˌɪm yə noʊˈglɒb yə lɪn, ɪˌmyu-/
any of several classes of structurally related proteins that function as antibodies or receptors and are found in plasma and other body fluids and in the membrane of certain cells. Compare IgA, IgD, IgE, IgG, and IgM.
the fraction of the blood serum containing antibodies.
an antibody.
Abbreviation: Ig.
Origin of immunoglobulin
1955-60; immuno- + globulin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for immunoglobulin
  • He has tracked the children's growth and measured their immunoglobulin levels to see if their immune systems are healthy.
  • Nephelometry determines the total amount of each immunoglobulin but cannot distinguish specific antibodies.
British Dictionary definitions for immunoglobulin


any of five classes of proteins, all of which show antibody activity. The most abundant ones are immunoglobulin G (IgG) and immunoglobulin A (IgA)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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immunoglobulin in Medicine

immunoglobulin im·mu·no·glob·u·lin (ĭm'yə-nō-glŏb'yə-lĭn, ĭ-myōō'-)
Abbr. Ig
Any of a group of large glycoproteins secreted by plasma cells in vertebrates that function as antibodies in the immune response by binding the specific antigens.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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immunoglobulin in Science
  (ĭm'yə-nō-glŏb'yə-lĭn, ĭ-my'-)   
See antibody.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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