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sustainer

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

First recorded in 1350–1400, sustainer is from the Middle English word sosteynere. See sustain, -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

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British Dictionary definitions for sustainer

sustainer

noun
  1. a rocket engine that maintains the velocity of a space vehicle after the booster has been jettisoned
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012