endoscope
Medical instrument for internal examination; used in procedures like gastroscopy or colonoscopy.
The doctor examined the inside of the stomach using an endoscope.
The endoscopic examination was easier than I expected.
gastroscope
endoscopic surgery
endoscopy; endoscopic examination
colonoscope · colonoscopy
nasal endoscope
laser endoscope
upper gastrointestinal endoscope; EGD scope · esophagogastroduodenoscopy; upper GI endoscopy
percutaneous endoscopic gastrostomy; PEG
Compound of 内 (inside) + 視 (see) + 鏡 (mirror/scope), a calque from Western medical terminology.