ˈendəˌskōp noun
Etymology: International Scientific Vocabulary end- + -scope; probably originally formed in French
1. : an instrument for visualizing the interior of a hollow organ or part (as the rectum or urethra) — compare bronchoscope , cystoscope , otoscope
2. : an optical instrument for examining the interior surface of a hole drilled through a pearl and used to distinguish between cultured and natural pearls