What does the prefix "epi" mean?

The prefix "epi" originates from Greek, meaning "above" or "upon." It indicates a position that is on top of or covering something else. This prefix is commonly used in various scientific and medical terms. For example, in "epidermis," the term refers to the outer layer of skin, which is situated above the underlying layers. Similarly, "epicenter" refers to the point on the Earth's surface that is directly above the focus of an earthquake, highlighting the concept of being above another reference point.

The other options do not align with the meaning conveyed by the prefix "epi." "Out, out of" suggests a movement away from something, which does not capture the positional or directional aspect of "epi." Likewise, "half, partial" suggests a division or fraction, while "below, deficient" implies a lack or positioning beneath something, both of which are distinctly different from the meaning of "epi."