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(jÄ«â²rÉ-skÅpâ²) An instrument consisting of a disk or wheel that spins rapidly about an axis like a top. The spinning motion keeps the axis fixed even if the base is turned in any direction, making the gyroscope an accurate navigational instrument and an effective stabilizing device in ships and airplanes.
stethoscope. 1  an instrument used to hear and amplify the sounds produced by the heart, lungs and other internal organs. 2  The modern stethoscope is binaural, with two earpieces and flexible rubber leading to them from the two-branched opening of the bell or cone.