vernier rocket

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vernier rocket

n.
A small rocket engine used primarily on spacecraft to make fine adjustments in velocity or attitude.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

vernier rocket

n
(Astronautics) another name for thruster2
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive
Aerojet said that it's Orbital Manoeuvring Engines, 38 primary and six Vernier thrusters on each Orbiter as well as gas generators supporting the Auxiliary Power Units, have flown on every shuttle mission since its launch inception in 1981.
Aerojet's engines contribute to STS-130's mission to ISS
Aerojet[sup.1]s Orbital Maneuvering Engines, 38 primary and six Vernier thrusters on each Orbiter, as well as gas generators supporting the Auxiliary Power Units, have flown on every Shuttle mission since its launch inception in 1981.
Aerospace & Defense News - Space
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