vaccine
nounUK /ˈvæk.siːn/
US /vækˈsiːn/
A shot that keeps you from getting sick.
The doctor gave me a vaccine so I won't catch the flu.
OTHER MEANINGS
2. A substance that teaches the body to fight a disease.
Scientists worked for years to develop a vaccine for the virus.
3. A protective medicine given before you get sick.
The vaccine protected the whole village from the disease.
4. A preparation made from weakened germs.
The vaccine contains a tiny, harmless piece of the germ.