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 Chronic stress can also negatively impact your immune system, causing frequent sickness. Dominique Fluker, Essence, 16 Apr. 2024 Attia takes rapamycin, a drug that affects the immune system and is normally used by organ-transplant patients; the drug, which occasionally gives him mouth sores, has seemed to lengthen the lives of laboratory animals. Dhruv Khullar, The New Yorker, 15 Apr. 2024 Artichoke nutrition includes fiber, vitamins, and antioxidants, which can help support your cardiovascular and immune systems. Cynthia Sass, Mph, Health, 13 Apr. 2024 While experts agree that breast milk benefits your baby's immune system, there isn't an official consensus about breast milk having the same benefits for adults. Sam Reed, Glamour, 11 Apr. 2024 How were incomplete viruses triggering the mice’s immune systems? Quanta Magazine, 11 Apr. 2024 Plus, patients hadn’t undergone treatments that changed their immune systems. Isabella Cueto, STAT, 27 Mar. 2024 Beyond your digestive system, experts say your gut microbiome also interacts with your brain and nervous system, your immune system and your endocrine system. Joanne Shurvell, Forbes, 27 Mar. 2024 Children who don’t consume micronutrients will develop weaker immune systems, leaving them more susceptible to infections that could cause diarrhea, pneumonia and fevers. Lauren Weber, Washington Post, 4 Apr. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'immune system.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

circa 1919, in the meaning defined above

Time Traveler
The first known use of immune system was circa 1919

Dictionary Entries Near immune system

Cite this Entry

“Immune system.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/immune%20system. Accessed 19 Apr. 2024.

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
Last Updated: - Updated example sentences
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