sustainer

[suh-stey-ner]
noun
1.
a person or thing that sustains.
2.
Rocketry.
a.
any stage of a multistage rocket or guided missile that sustains flight after the burnout of the booster.
b.
the rocket engine or cluster of engines contained in such a stage.

Origin:
1350–1400; Middle English sosteynere. See sustain, -er1

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World English Dictionary
sustainer (səˈsteɪnə)
 
n
a rocket engine that maintains the velocity of a space vehicle after the booster has been jettisoned

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Exports had been an important sustainer for growth, but are losing steam as the world enters a recession.
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