Endoscopy (noun)

1. A medical procedure in which the inside of the body is examined using an endoscope, a long, flexible tube with a light and camera.
2. The examination of the interior of a body part or organ using an endoscope.

Origin:

From greek ἔνδον (éndon, "within") + -scopy, from σκοπεῖν (skopeîn, "to look at, examin.e")

Examples:

1. He had an endoscopy to check for stomach ulcers.
2. The endoscopy revealed a polyp in her colon.
3. The endoscopy is a non-invasive way to examine the digestive tract.
4. The doctor used an endoscope to perform the endoscopy.
5. The endoscopy showed signs of inflammation in the esophagus.