noun
Medical instrument used to examine the colon. Compare 大腸内視鏡, which is a more common term for colonoscope.
See also: 大腸内視鏡
医師は結腸鏡を使って大腸の内部を観察した。
The doctor used a colonoscope to observe the inside of the large intestine.
Compound of 結腸 (colon) + 鏡 (scope, mirror).