Which word refers to a device designed to direct the flow of air or fluid?

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The word that refers to a device designed to direct the flow of air or fluid is "Schubdüse." This term translates to "thrust nozzle" in English and is commonly used in engineering and fluid dynamics contexts. A thrust nozzle is specifically engineered to control and direct the flow of gases or liquids, making it essential in various applications such as jet propulsion, exhaust systems, and fluid delivery systems. This device allows for precise control of the flow characteristics and is critical in optimizing performance in mechanical systems.

The other terms listed do not relate directly to the flow of air or fluid. For instance, "Kabelschuh" refers to a terminal lug used for attaching wires, "Auflage" means a support or base, while "Gummihammer" translates to a rubber mallet, which is a tool for striking objects without marring their surface.