immune system

noun

: the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), macrophages, lymphocytes including the B cells and T cells, and antibodies

Examples of immune system in a Sentence

Recent Examples on the Web

Eating the rainbow, in general, is important because fruits and vegetables contain thousands of phytochemicals that are a part of a plant’s immune system and keep us healthy. —Sara Novak, Discover Magazine, 13 Dec. 2024

The substances have also been linked to a range of health issues including cancers, and issues with the thyroid, immune system and fertility. —Rachel Frazin, The Hill, 12 Dec. 2024

Fruits and vegetables in particular contain a lot of vitamin C, which is not only important for the immune system, but also for healthy eyes. —Maria Berentzen, Vogue, 12 Dec. 2024

Studies have also linked oral exposure to PFAS to adverse health effects on the liver, the kidneys, and the immune system, and cancer, according to the EPA. —Sarah Lapidus, The Arizona Republic, 11 Dec. 2024

Word History

First Known Use

circa 1919, in the meaning defined above

Kids Definition

immune system

noun

: the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, lymphocytes, and antibodies

Medical Definition

immune system

noun

: the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), lymphocytes including the B cells and T cells, and antibodies