vernier engine


noun Rocketry.

a small, low-thrust rocket engine for correcting the heading and velocity of a long-range ballistic missile.
Also called vernier rocket.
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British Dictionary definitions for vernier rocket

vernier rocket


noun

another name for thruster (def. 2)
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