thruster

[ thruhs-ter ]
/ ˈθrʌs tər /

noun

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.

Origin of thruster

First recorded in 1590–1600; thrust + -er1

British Dictionary definitions for thruster

thruster
/ (ˈθrʌstə) /

noun

a person or thing that thrusts
Also called: vernier rocket a small rocket engine, esp one used to correct the altitude or course of a spacecraft
an auxiliary propeller on a ship, capable of acting athwartships