Question

antigen When the immune system is weak, it may not be able to produce enough antibodies to combat the invading antigens. ˈæntəʤən

Accepted Answer

A chemical substance (such as a protein) that, when introduced into the body, causes the body to form antibodies against it. An antibody is a protein produced by your immune system to fight outside invaders. Since the enemy substance actually triggers the production of antibodies, such substances are called antigens—anti- being short for antibody, and -gen meaning “producer.” (In a similar way, an allergen produces an allergy, and a pathogen produces a pathology or disease.) Antigens are often rodlike structures that stick out from the surface of an invading organism—usually a bacterium or a virus—and allow it to attach itself to cells in the invaded body. But unfortunately for them, in doing so they let the immune system know they're present, and the body is flooded with an army of Pac-Man-like antibodies

word	antigen
definition	A chemical substance (such as a protein) that, when introduced into the body, causes the body to form antibodies against it.
eg_sentence	When the immune system is weak, it may not be able to produce enough antibodies to combat the invading antigens.
explanation	An antibody is a protein produced by your immune system to fight outside invaders. Since the enemy substance actually triggers the production of antibodies, such substances are called antigens—anti- being short for antibody, and -gen meaning “producer.” (In a similar way, an allergen produces an allergy, and a pathogen produces a pathology or disease.) Antigens are often rodlike structures that stick out from the surface of an invading organism—usually a bacterium or a virus—and allow it to attach itself to cells in the invaded body. But unfortunately for them, in doing so they let the immune system know they're present, and the body is flooded with an army of Pac-Man-like antibodies
IPA	ˈæntəʤən

Antibodies Immune System Substance Body Invading Produces Antigen