1. thruster(n = noun.person) pusher - one who intrudes or pushes himself forward;
is a kind of interloper, intruder, trespasser
Derived form verb thrust3
2. thruster(n = noun.artifact) - a small rocket engine that provides the thrust needed to maneuver a spacecraft;
is a kind of rocket, rocket engine
One who thrusts or stabs. [1913 Webster]
thruster, n.
1 a person or thing that thrusts.
2 a small rocket engine used to provide extra or correcting thrust on a spacecraft.