What does the root "gli/o" refer to?

The root "gli/o" refers to "glue," particularly in a biological context where it describes the supportive tissue of the nervous system known as glia. This tissue includes various types of cells that provide support, nourishment, and protection to neurons. The term "neuroglia," for example, refers to the non-neuronal cells in the nervous system that maintain homeostasis, form myelin, and provide support and protection for neurons. In this sense, the term underscores the essential role of these cells in maintaining the overall health and function of the nervous system, akin to how glue functions to bind materials together. Understanding this root is crucial for interpreting various medical and biological terms related to neurological health and diseases.