a person or thing that thrusts.
Fox Hunting. a rider who keeps in the front of the field.
Aerospace. a small rocket attached to a spacecraft and used to control its attitude or translational motion.

1590–1600; thrust + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thruster (ˈθrʌstə)
1.  a person or thing that thrusts
2.  Also called: vernier rocket a small rocket engine, esp one used to correct the altitude or course of a spacecraft
3.  an auxiliary propeller on a ship, capable of acting athwartships

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
For the spacecraft with truly modern flair, an ion thruster is the only way to go.
But there is enough air to prevent a rocket from steering effectively with thruster jets, as it can in space.
In an ion thruster, electricity is used to accelerate ions out the back.
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