What does the prefix "endo-" mean?

The prefix "endo-" originates from Greek, meaning "inside" or "within." It is commonly used in various scientific and medical terms to signify something located internally or existing within a particular structure or system. For example, in the term "endoscope," it refers to a tool used to look inside a body cavity or organ. This prefix indicates the concept of being internal or enclosed, making it vital in describing processes, locations, or structures that are situated within something else. Understanding this prefix is essential in recognizing and interpreting various terms across different fields, particularly in biology and medicine.