Etymology
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colonoscopy (n.)

by 1902 (earlier procto-colonoscopy, 1896), from colon (n.2) + -scopy. Colonoscope is attested from 1884 

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Definitions of colonoscopy

colonoscopy (n.)
visual examination of the colon (with a colonoscope) from the cecum to the rectum; requires sedation;
From wordnet.princeton.edu