gastroscopy
noun
the examination with a gastroscope to detect disease.
The grammatical form denoting more than one person, place, thing, or idea.
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All of the recent gastroscopies in the Bronchoscopic Clinic, however, have been performed without anesthesia.
From Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery by Chevalier Jackson