Longman Dictionary of Contemporary English homepage

booster

noun
     
Related topics: Drugs, Medicines, Space
boost‧er [countable]
1MD a small quantity of a drug that increases the effect of one that was given before, so that someone continues to be protected against a disease:
a booster shot
2 something that helps someone or something to increase or improve, or to be more successful or confident:
a booster pump
a profit booster for the company
morale/confidence booster
Mail from home is a big morale booster for far-away troops.
3TTS a rocket that is used to provide extra power for a spacecraft to leave the Earth:
a giant booster rocket
4 American English someone who gives a lot of support to a person, organization, or an idea:
a dance organized by the school's booster club

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