Booster

/bˈuːstɐ/

/ˈbustɝ/

Booster

NOUN

a rocket that gives a spacecraft or missile the extra power it needs to leave the Earth's atmosphere

an additional dose of vaccine required periodically in order to increase, maintain, or renew the effects of a previous one

What is a "booster"?

A booster is an extra dose of a vaccine given to strengthen the immune response after the first doses. Boosters are typically given after the first vaccination series to ensure long-term protection against certain diseases. They help strengthen the body's defense and provide added protection against infections that may decrease over time or need extra support.

an amplifier for restoring the strength of a transmitted signal