Endoscopy - Visual inspection of a body cavity. Performed with, what else, an endoscope.
May I remind you that these come from my head without references and that you can challenge me if you like? Simply leave a comment and I'll do my best to define your challenge word without help. I'll even let you know if you win. You might even get a prize*.
*Prize not guaranteed. Not valid in states or countries containing the letter 'E'. Must be at least 143 weeks old to enter. Must not be older than 2439 months to enter**.
**Almost none of that is true. I have fired the person that wrote it. The only part that applies is that you must not be older than 2439 months because that would be crazy.