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

Strawberries can aid the body in silencing allergies Depositphotos A study out of the Tokyo University of Science found that the flavonoid kaempferol can dampen the body’s allergic response – including food allergies – via its effect on the immune system. —New Atlas, 30 Dec. 2024

Severe infections are most common among children younger than 5 years old, older adults and people with weakened immune systems. —George Monastiriakos, Newsweek, 30 Dec. 2024

Children under 5 years old, older adults and people with weakened immune systems are more likely to get severe infections, the CDC said. —Jenna Prestininzi, Detroit Free Press, 30 Dec. 2024

Most healthy people recover without treatment, but severe cases can occur, especially in young children, elderly people and those with weakened immune systems. —Marley Malenfant, Austin American-Statesman, 30 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