the.com/control thruster

means A small directional rocket engine used to adjust the orientation or fine position of a spacecraft, rather than to provide its main propulsion.

from A straightforward compound: 'control,' from Old French 'contrerole' (a duplicate register kept to check an original — the root sense being verification and regulation), fused with 'thruster,' the agent noun from 'thrust,' a word of Old Norse lineage meaning to push or drive forcefully. The term itself is a 20th-century coinage from aerospace engineering, emerging alongside rocketry and spaceflight as engineers needed a name for the small jets — often arranged in clusters — that nudge, spin, or tilt a craft without changing its main velocity.