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immune system Line breaks: im¦mune sys¦tem

Entry from British & World English dictionary

Definition of immune system in English:


The organs and processes of the body that provide resistance to infection and toxins. Organs include the thymus, bone marrow, and lymph nodes.
Example sentences
  • The infection causes the immune system to activate white blood cells and chemicals to fight the bacteria.
  • They also discovered that the host animal must have a healthy immune system for infection to take hold.
  • Premature babies are at increased risk of infection because their immune systems are immature.
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