gyroscope
n. US //ˈdʒaɪɹəˌskoʊp// UK //dʒˈaɪɹəskˌəʊp// gy·ro·scope
Borrowed from French gyroscope, coined in 1852 by physicist Leon Foucault, equivalent to gyro- + -scope, from Ancient Greek γῦρος (gûros, “circle”) and σκοπός (skopós, “watcher”).