immune system

noun

Definition of immune system 

: 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

In your digestive tract, those invisible ecosystems play important roles not only in digestion but also in the immune system and the endocrine system, influencing the hormones that help regulate bodily functions. Kiona N. Smith, Ars Technica, "Mammals inherit most of their gut bacteria, new study suggests," 26 Oct. 2018 Cortisol: The body’s stress hormone; normal levels help to regulate blood sugar and the immune system. Lauren Valenti, Vogue, "Why Every 20-Something Should Know More About Their Hormones—and Their Body," 25 Oct. 2018 Research shows that the deficiency may interfere with fetal development of bones, lungs and the immune system, and lead to a newborn with reduced growth and a greater chance of respiratory problems. Michael Roizen, M.d., And Mehmet Oz, Houston Chronicle, "How can you recognize and prevent suicide?," 17 June 2018 The researchers studied genes linked to the placenta, the maternal immune system and the fetal liver, and found nine of those genes produce RNA signals that change distinctly as pregnancy progresses. Pam Belluck, New York Times, "Blood Test Might Predict Pregnancy Due Date and Preterm Birth," 7 June 2018 What the food’s devotees might not have predicted, however, is that dark chocolate also shrinks inflammation while strengthening memory and the immune system, according to a new study from Loma Linda University. Sun-Sentinel.com, "Eating the right kind of dark chocolate will improve your life," 25 Apr. 2018 Since then, numerous studies have bolstered the link between dementia and the brain’s immune system, highlighting the cells and signals involved2. Alison Abbott, Scientific American, "Is "Friendly Fire" in the Brain Provoking Alzheimer's Disease?," 24 Apr. 2018 That said, the disease can be more dangerous for the elderly, children under 5, and people with weakened immune systems — and serious cases may require antibiotics and hospitalization. Emma Sarran Webster, Teen Vogue, "A Salmonella Outbreak Linked to Raw Turkey Has Spread to 35 States," 13 Nov. 2018 Health officials said that the #7 strain of adenovirus at the Wanaque Center is associated with communal living arrangements and dangerous to people with weakened immune systems. Melanie Grayce West, WSJ, "Virus Kills Seven Children at New Jersey Medical Facility," 24 Oct. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'immune system.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of immune system

circa 1919, in the meaning defined above

Keep scrolling for more

Learn More about immune system

Share immune system

Statistics for immune system

Last Updated

8 Dec 2018

Look-up Popularity

Time Traveler for immune system

The first known use of immune system was circa 1919

See more words from the same year

Keep scrolling for more

More Definitions for immune system

immune system

noun

English Language Learners Definition of immune system

: the system that protects your body from diseases and infections

immune system

noun

Kids Definition of immune system

: the system of the body that fights infection and disease and that includes especially the white blood cells and antibodies and the organs that produce them

immune system

noun

Medical Definition of immune system 

: 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

Keep scrolling for more

Comments on immune system

What made you want to look up immune system? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a typical or ideal example

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!