The prefix 'ep-' denotes what meaning in medical terminology?

The prefix 'ep-' originates from the Greek preposition "epi," which translates to 'above,' 'upon,' or 'over.' In medical terminology, this prefix is often used to denote something that is situated on top of or over another structure. For example, in the term 'epidermis,' 'epi-' refers to the outer layer of skin that lies upon the dermis. This understanding of 'ep-' helps in deciphering various medical terms where the prefix indicates a position or relationship relative to other structures in the body.