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gas·tro·scope / ˈgastrəˌskōp/ • n. an optical instrument used for inspecting the interior of the stomach. DERIVATIVES: gas·tro·scop·ic / ˌgastrəˈskäpik/ adj. gas·tros·co·py / gaˈsträskəpē/ n.

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gastroscope (gas-trŏ-skohp) n. an illuminated optical instrument used to inspect the interior of the stomach. Modern instruments transmit the image through a fibreoptic bundle or by a tiny video camera, allowing all areas of the stomach to be seen and photographed and specimens to be taken for microscopic examination. Therapeutic procedures may be performed.
gastroscopy (gas-tros-kŏ-pi) n.