What is the meaning of the root word "photo"?

The root word "photo" originates from the Greek word "phōs," which translates to "light." This root is commonly found in various terms associated with light or processes that involve light. For example, "photograph" combines "photo" with "graph," meaning to write or draw, ultimately meaning "to draw with light." Similarly, "photosynthesis" refers to the process whereby plants use light to synthesize food from carbon dioxide and water. Understanding this root word is essential in comprehending the meanings of numerous scientific and everyday terms related to light.