Antigen meaning

-jēn
Frequency:
A molecule that is capable of binding to an antibody or to an antigen receptor on a T cell, especially one that induces an immune response. An antigen is usually a foreign substance, such as a toxin or a component of a virus, bacterium, or parasite.
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(immunology) A substance that induces an immune response, usually foreign.
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The definition of antigen is a harmful substance which enters the body which causes the body to make antibodies as a response to fight off disease.

An example of an antigen is a common cold virus which causes the body to make antibodies which help prevent the person from getting sick.

noun
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A substance that stimulates the production of an antibody when introduced into the body. Antigens include toxins, bacteria, viruses, and other foreign substances.
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A protein, toxin, or other substance of high molecular weight, to which the body reacts by producing antibodies.
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A substance that when introduced into the body stimulates the production of an antibody. Antigens include toxins, bacteria, foreign blood cells, and the cells of transplanted organs.
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Origin of antigen

  • From French antigène, from anti- + gène.

    From Wiktionary