from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a group of large glycoproteins that are secreted by plasma cells and that function as antibodies in the immune response by binding with specific antigens. There are five classes of immunoglobulins: IgA, IgD, IgE, IgG, and IgM.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of the glycoproteins in blood serum that respond to invasion by foreign antigens and that protect the host by removing pathogens; an antibody.
from the GNU version of the Collaborative International Dictionary of English
- n. any one of a class of globular proteins which are antibodies and are produced by the immune system in animals.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response
From immuno- + globulin. (Wiktionary)