IPA: /ˈθrʌstər/
KK: /ˈθrʌstər/
A device used to push or propel an object, commonly found in ships or spacecraft, to help with movement and steering.
The ship's thruster helped it maneuver easily in the tight harbor.
Thruster is formed from "thrust" (from Old English "þrustan", meaning to push or shove) and the suffix "-er" (meaning a person or thing that performs an action). The word "thruster" refers to a device or person that pushes or propels something forward.
Think of someone or something that 'pushes' ('thrust') — the '-er' indicates that it performs the action of pushing.