Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A Y-shaped protein on the surface of B cells that is secreted into the blood or lymph in response to an antigenic stimulus, such as a bacterium, virus, parasite, or transplanted organ, and that neutralizes the antigen by binding specifically to it; an immunoglobulin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A protein produced by B-lymphocytes that binds to a specific antigen.

from the GNU version of the Collaborative International Dictionary of English

  • n. Any of various bodies or substances in the blood which act in antagonism to harmful foreign bodies, as toxins or the bacteria producing the toxins. Normal blood serum apparently contains various antibodies, and the introduction of toxins or of foreign cells also stimulates production of their specific antibodies by the immune system.
  • n. more narrowly, any of the immunoglobulins present in the blood serum or other body fluids of an animal, which reacts with a specific antigenic substance, whether the antibody was produced as a consequence of the stimulus provided by the antigen, or was pre-existing prior to exposure of the organism to the antigen.

from The Century Dictionary and Cyclopedia

  • n. A body or substance which inhibits the action of another substance. Also called antisubstance and, as a general term, adaptation-product. See adaptation-product and immunity.

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

  • n. any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response

Etymologies

Translation of German Antikörper : anti-, antagonistic (from Latin anti-, anti-) + Körper, body.
(American Heritage® Dictionary of the English Language, Fourth Edition)
anti- +‎ body, a calque of German Antikörper. (Wiktionary)

Examples

  • In the foregoing illustration it has been assumed that complete acquired active immunity has been conferred upon the experimental rabbit in consequence of the formation of antibody, specific to the diplococcus pneumoniac, sufficient in amount to ensure the destruction of enormous doses of the living cocci -- the _antigen_ (that is the substance injected in response to which _antibody_ has been elaborated) in this particular case being the bacterial protoplasm of the pneumococcus with its endo-toxins.

    The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.

  • If your child has the hepatitis D virus infection a blood test will show the anti-delta antibody is positive for hepatitis D virus.

    Hepatitis D

  • Most vaccines work in terms of stimulating something known as antibody, which is a protein substance in the body.

    Potent Antibodies Offer New AIDS Vaccine Design

  • The antibody is a protein where the building stones - amino acids normally form four chains.

    Physiology or Medicine 1987 - Press Release

  • When the functioning gene of an antibody is to be created a single V, D and J gene are drawn at random from the three groups of genes.

    Physiology or Medicine 1987 - Press Release

  • The red colouring matter of the erythrocytes makes them, moreover, a very convenient reagent for research work of that kind because the action of the haemolytic antibody is directly proportional to it and can be directly estimated according to the quantity of colouring matter which, when the red corpuscles are destroyed, is dissolved in the surrounding fluid.

    Physiology or Medicine 1919 - Presentation Speech

  • "The ultimate goal is an active vaccine that elicits a robust, long-term antibody response," Wilson said.

    Breaking News: CBS News

  • Metozolv odtmetozolv odt is a fast-dissolving of interaction for the short-term antibody of medicines with gastroesophageal shape and for the vaccine of mushrooms utilized with id gastroparesis.

    Wii-volution

  • The process, in which an antibody, called an IgE antibody, that is supposed to fight infections like parasites, instead recognizes certain food proteins as abnormal invaders within the body.

    Susan Weissman: New and Promising Food Allergy Treatment 'Tricks' the Immune System

  • As soon as the immune system realizes the body has been attacked by a foreign body, a type of white blood cell protein called an antibody jumps into action.

    The Panic Virus

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