noun
propeller; propulsion device
Technical term for a mechanical device that generates thrust, such as a propeller or impeller. Used in engineering and aviation contexts.
この船は新型の推進機を搭載している。
This ship is equipped with a new type of propeller.
推進機の設計には流体力学の知識が必要だ。
Designing a propulsion device requires knowledge of fluid dynamics.
推進器 is a synonym with the same reading and meaning, but 推進機 is the more common kanji form.
Compound of 推進 (propulsion) + 機 (machine/device).