What does the prefix "epi-" refer to?

The prefix "epi-" comes from Greek, meaning "on" or "above." It is commonly used in various terms across different fields, such as medicine and biology. For example, in the term "epidermis," which refers to the outer layer of skin, "epi-" indicates that this layer is positioned above or on top of the deeper layers. This prefix helps convey spatial relationships and positions, clarifying the context in which it is used. The understanding of such prefixes is important in the field of reporting, especially when transcribing technical terminology accurately.