What is phy?

Phy is a prefix that originates from the Greek word "physis," meaning nature or natural. It is commonly used in scientific terms to denote something related to nature, physical properties, or the natural world. For example, physics is the branch of science that deals with the study of matter, energy, motion, and force in the natural world. Other examples of words that use the prefix phy include physiology (the study of how living organisms function) and photosynthesis (the process by which plants convert sunlight into energy).