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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.
EGD stands for esophagogastrodudenoscopy and it pertains to a visual inspection of the esophagus, the stomach and upper duodenum. The procedure is done by inserting a flexible endoscope down the throat.An endoscope is a small camera that functions as a tool to examine the internal organs.ith EGD, the esophagus, stomach and duodenum linings are examined. The endoscope is capable of taking biopsies by retrieving tissue samples that will be examined later under a microscope.