antibody

[an-ti-bod-ee] /ˈæn tɪˌbɒd i/

noun, plural antibodies.

any of numerous Y -shaped protein molecules produced by B cells as a primary immune defense, each molecule and its clones having a unique binding site that can combine with the complementary site of a foreign antigen, as on a virus or bacterium, thereby disabling the antigen and signaling other immune defenses.

Abbreviation: Ab.

antibodies of a particular type collectively.

Also called immunoglobulin.

Origin

1895-1900; anti- + body

Can be confused

antibody, anybody (see usage note at anybody)

Examples from the web for antibody

antibody production increases during the course of an infection.
Even slight changes in the shape of a protein may affect how well a particular antibody sticks to it.
There is a different antibody for each kind of germ.
We are also using biologic agents now, meaning antibody therapy.
Tests are often repeated during the course of an illness to detect a rise in antibody levels.
In the first stages of an illness, little antibody may be detected.
They are both the cancer and the foundation of our networked world, both virus and antibody.
Your antibody work shows that relatively short sequences of protein are present and recognizable.
The sample is sent to a lab, where it is mixed with latex beads coated with a specific antibody or antigen.
We were able to identify what this antibody recognizes.

British Dictionary definitions for antibody

antibody

/ˈæntɪˌbɒdɪ/

noun (pl) -bodies

any of various proteins produced in the blood in response to the presence of an antigen. By becoming attached to antigens on infectious organisms antibodies can render them harmless or cause them to be destroyed See also immunoglobulin

Word Origin and History for antibody

"substance developed in blood as an antitoxin," 1901, a hybrid formed from anti- "against" + body. Probably a translation of German Antikörper, condensed from a phrase such as anti-toxisches Körper "anti-toxic body."

antibody in Medicine

antibody an·ti·bod·y (ān'tĭ-bŏd'ē)
n.

Abbr. Ab A protein substance produced in the blood or tissues in response to a specific antigen, such as a bacterium or a toxin, that destroys or weakens bacteria and neutralizes organic poisons, thus forming the basis of immunity.
An immunoglobulin present in the blood serum or body fluids as a result of antigenic stimulus and interacting only with the antigen that induced it or with an antigen closely related to it.

antibody in Science

antibody

(ān'tĭ-bŏd'ē)

Any of numerous proteins produced by B lymphocytes in response to the presence of specific foreign antigens, including microorganisms and toxins. Antibodies consist of two pairs of polypeptide chains, called heavy chains and light chains, that are arranged in a Y-shape. The two tips of the Y are the regions that bind to antigens and deactivate them. Also called immunoglobulin.

Our Living Language : Like other vertebrates, humans possess an effective immune system that uses antibodies to fight bacteria, viruses, and cancer cells. Antibodies are complex, Y-shaped protein molecules. The immune system's B lymphocytes, which are produced by the bone marrow, develop into plasma cells that can generate a huge variety of antibodies, each one capable of combining with and destroying an antigen, a foreign molecule. Antibodies react to very specific characteristics of different antigens, binding them to the top ends of their Y formation. Once the antibody and antigen combine, the antibodies deactivate the antigen or lead it to macrophages(a kind of white blood cell) that ingest and destroy it. High numbers of a particular antibody may persist for months after an invasion, eventually diminishing. However, the B cells can quickly manufacture more of the same antibody if exposure to the antigen recurs. Vaccines work by "training" B cells to recognize and react quickly to potential disease molecules.