Noun: booster unit 'boos-tu(r) 'yoo-nit
- The first stage of a multistage rocket that provides initial thrust
"The booster unit separated from the spacecraft after reaching the upper atmosphere";
- booster, booster rocket, takeoff booster, takeoff rocket
Derived forms: booster units
Type of: rocket, rocket engine
Part of: multistage rocket, step rocket
Encyclopedia: Booster unit