boatswain [boatswains]◼◼◼(officer of a sailing ship) noun [UK: ˈbəʊs.n̩] [US: ˈboʊs.n̩]
stroboscope nom {m}
stroboscope [stroboscopes]◼◼◼(instrument for studying or observing periodic movement by rendering a moving body visible only at regular intervals) noun [UK: ˈstrəʊ.bə.skəʊp] [US: ˈstroʊ.bəskoʊp]