booster unit

Thesaurus

Noun

1.

booster unit - the first stage of a multistage rocketbooster rocket, takeoff booster, takeoff rocket, boostermultistage rocket, step rocket - a rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhaustedrocket engine, rocket - a jet engine containing its own propellant and driven by reaction propulsion