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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
However, individuals with weakened immune systems, premature infants, or critically ill patients may be at higher risk for serious infections and should only use probiotics under close supervision of their healthcare provider.
—Elizabeth Barnes, Verywell Health, 5 Nov. 2024
No illnesses have been reported so far, however, Listeria infections can be dangerous, particularly for older people, young kids, people with weakened immune systems, and pregnant people.
—Julia Landwehr, Health, 5 Nov. 2024
For most people, regularly getting eight hours of sleep boosts memory retention, enhances concentration, augments creativity, stabilizes emotions, strengthens the immune system, enhances athletic performance, and staves off deadly ailments like cancers and heart disease.
—Dr. Peter H. Diamandis, TIME, 4 Nov. 2024
Listeria is a particularly resilient bacterium that can cause severe health complications, particularly for pregnant women, the elderly, newborns and those with weakened immune systems.
—David Faris, Newsweek, 3 Nov. 2024
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Word History
First Known Use
circa 1919, in the meaning defined above
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 23 Nov. 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
More from Merriam-Webster on immune system
Nglish: Translation of immune system for Spanish Speakers
Britannica English: Translation of immune system for Arabic Speakers
Britannica.com: Encyclopedia article about immune system
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