Medical lead-in to -scope

OTO

Think of the body part that helps you hear when solving this medical prefix.

This clue is looking for a prefix used in medical terms that means "ear," which is then attached to "-scope" (an instrument for viewing). The answer is "OTO," as in otoscope—a device doctors use to examine ears. The wordplay is straightforward: "lead-in" hints at a prefix, and "-scope" confirms it’s part of a medical tool’s name.