We found one dictionary that defines the word sustainer rocket engine:

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1. sustainer rocket engine: Encyclopedia

▸ Words similar to sustainer rocket engine ▸ Usage examples for sustainer rocket engine ▸ Idioms related to sustainer rocket engine ▸ Wikipedia articles (New!) ▸ Words that often appear near sustainer rocket engine ▸ Rhymes of sustainer rocket engine ▸ Invented words related to sustainer rocket engine