Definition, Meaning & Synonyms

vaccine

Noun

/vækˈsiːn/

Definition

A substance that stimulates the body’s immune response against diseases.

Examples

The flu vaccine is recommended every year to protect against seasonal outbreaks.
Vaccines have helped eliminate diseases like smallpox.
Her doctor advised her to get the HPV vaccine for her health.

Meaning

Vaccines work by introducing a harmless component of a disease-causing organism to the immune system, prompting it to recognize and fight off the actual pathogen if encountered in the future.