# thruster

/ˈθɹəstɝ/ (US) · /θɹˈʌstɐ/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/thruster
Updated: 2026-10-13

## Definition

a small engine on a ship or spacecraft used to control its direction or speed. You use these to make careful movements, like when a boat is docking.

For teachers: a small propulsive engine or nozzle used for station-keeping, attitude control, or low-thrust maneuvers. In nautical contexts, it typically refers to a transverse propulsion device used to improve maneuverability in tight spaces.

## Examples

- The pilot used the bow thruster to move the ship closer to the dock.
- Modern cruise ships rely on powerful side thrusters to navigate narrow ports without the assistance of tugboats.
- Precise docking maneuvers require the coordinated firing of multiple thrusters to counteract the effects of strong currents and wind against the vessel's hull.

## Synonyms

jet

## Usage notes

- Commonly appears in compound nouns like 'bow thruster' or 'stern thruster'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.