'Thruster' definitions:

Definition of 'thruster'

(from WordNet)
noun
One who intrudes or pushes himself forward [syn: pusher, thruster]
noun
A small rocket engine that provides the thrust needed to maneuver a spacecraft

Definition of 'Thruster'

From: GCIDE
  • Thruster \Thrust"er\, n. One who thrusts or stabs. [1913 Webster]