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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.
periscope meaning, definition, what is periscope: a long, vertical tube containing a set of mirrors that gives you a view of what is aboveâ¦. Learn more.