[ˈvaksɪn], (Noun)

Definitions:
- a substance used to stimulate immunity to a particular infectious disease or pathogen, typically prepared from an inactivated or weakened form of the causative agent or from its constituents or products
(e.g: every year the flu vaccine is modified to deal with new strains of the virus)

- a program designed to detect computer viruses and inactivate them
(e.g: the rate of use of vaccines for computer viruses is not as high as in the US, Japan, and other countries)


Phrases:

Origin:
late 18th century: from Latin vaccinus, from vacca ‘cow’ (because of the early use of the cowpox virus against smallpox)