step rocket

Noun
  1. A rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted (synset 103804897)
    is a type of: projectile, rocket - any vehicle self-propelled by a rocket engine
    has: booster, booster rocket, booster unit, takeoff booster, takeoff rocket - the first stage of a multistage rocket
    same as: multistage rocket

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