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

The main factor seems to be their immune system, which has developed to counter many viruses. —Jack Knudson, Discover Magazine, 5 June 2025

Typically the main treatment for both HL and NHL Immunotherapy: Medications that target specific proteins on cancer cells that help the immune system fight the cancer. —Gagandeep Brar, Verywell Health, 4 June 2025

This occurs when the immune system responds to the implant by causing scar tissue to form and tighten around it. —Kaleigh Werner, Footwear News, 4 June 2025

In addition to changing how the immune system works, being pregnant also makes women five times as likely to have blood clots. —Kff Health News, Oc Register, 2 June 2025

Word History

First Known Use

circa 1919, in the meaning defined above

Rhymes for immune system

• cryptosystem
• ecosystem
• intersystem
• multisystem
• photosystem
• subsystem

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