booster

1. Something that boosts.
2. The first stage of a multistage rocket, providing primary or supplemental thrust for liftoff and early flight.
3. A motor-generator set used for voltage regulation in direct current electrical power circuits.
4. Someone who publicly promotes or endorses (something or someone); a fan or supporter.
5. A member of a booster club.
6. A booster dose. · When did you get your last tetanus booster?
7. A small quantity of a sensitive explosive that is triggered by a detonator and provides the energy needed to detonate a larger quantity of a less-sensitive explosive.
8. A term that serves to amplify or strengthen an utterance, such as "really".

Plural boosters