What is the meaning of "endo-" in medical terminology?

The prefix "endo-" in medical terminology means "inner" or "within." This prefix is derived from the Greek word "endon," which translates to "inside" or "within." It is commonly used in terms such as "endoscopy," where "endo-" refers to examining the interior of a hollow organ or cavity. Understanding this prefix is crucial in medical contexts, as it helps to indicate the location or position of structures relative to one another. By identifying "endo-" with the concept of being inner or within, it becomes easier to comprehend various medical terms that utilize this prefix.