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gyroscope 1 today an instrument with a turning wheel, mounted on an axis that can turn in any direction. When the axis turns, the wheel stays level. Gyroscopes are used to help keep ships and airplanes on course. Main Int.
compact disk 1 today a palm-sized disk on which music, data, or the like has been digitally encoded, that is read by laser and transmitted to a playback device. Main Adv.