ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  booster unit - the first stage of a multistage rocketmultistage 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 exhausted rocket engine, rocket - a jet engine containing its own propellant and driven by reaction propulsion |
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