From The Collaborative International Dictionary of English v.0.48 [gcide]:
Endoscope \En"do*scope\, noun [Endo- + -scope.] (Med.) An instrument for examining the interior of the body, consisting of a flexible tube with lenses and optical fibers permitting illumination of the interior site to be inspected, and visualization of the interior site from outside the body; it often has small surgical instruments attached to the end and manipulable from the outside, permitting biopsy or surgery. It is used as a non-invasive or minimally invasive tool for diagnosis or treatment, especially in organs having an external opening such as the rectum, the urethra, and the bladder. [1913 Webster +PJC]
From WordNet (r) 3.0 (2006) [wn]:
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