The prefix pyo is derived from the Greek word pyon, which means pus. In medical terminology, it is commonly used to denote something related to pus or a purulent condition. For example, pyoderma refers to a skin infection that involves pus, and pyometra refers to an accumulation of pus in the uterus.
Understanding the meaning of prefixes like pyo can be helpful in deciphering complex medical terms and understanding their implications in health and disease.