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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
Infants, older adults, and people with weakened immune systems are more vulnerable to complications and should seek prompt care if symptoms worsen.
—Abby Norman, Verywell Health, 2 Dec. 2024
Listeria is a foodborne bacterial illness, that can cause listeriosis, which primarily affects older adults, people with weakened immune systems, pregnant women and newborns.
—Greta Cross, USA TODAY, 2 Dec. 2024
Salmonella can be especially dangerous to young children, elderly people, or those with weakened immune systems.
—Abigail Wilt, Southern Living, 2 Dec. 2024
Salmonella can cause fatal infections in young children, elderly people or other individuals with weakened immune systems.
—Megan Cerullo, CBS News, 28 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 11 Dec. 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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