What does the root word "hydro-" signify?

The root word "hydro-" originates from the Greek word "hydor," which means water. This prefix is commonly used in various fields, particularly in science and medicine, to denote anything related to water. For instance, terms like "hydration" refer to water content in the body, and "hydrology" pertains to the study of water and its movement in the environment. Understanding this root is essential for grasping the meaning of many scientific terms that involve water in specific contexts.