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vernier engine

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noun Rocketry.
  1. a small, low-thrust rocket engine for correcting the heading and velocity of a long-range ballistic missile.
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Also called vernier rocket.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for vernier rocket

vernier rocket

noun
  1. another name for thruster (def. 2)
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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