In medical terminology, what does "Py-" specifically indicate about a substance?

In medical terminology, the prefix "py-" specifically indicates that a substance is related to pus. This prefix originates from the Greek word "pur," which means pus. When used in various terms within the medical field, it denotes conditions or substances that involve pus formation, often indicating the presence of an infection or inflammatory process. For example, terms like "pyoderma" refer to a skin condition characterized by the presence of pus. Recognizing this prefix helps in understanding various medical conditions associated with pus and the body's response to infection.