Which root word refers to the mouth in medical terminology?

The root word that refers to the mouth in medical terminology is "stomat/o." This term is derived from the Greek word "stoma," which means "mouth." It is commonly used in various medical contexts to describe conditions, treatments, and anatomy related to the mouth. For instance, terms such as "stomatitis," which indicates inflammation of the mouth, utilize this root word to convey that the condition affects the oral cavity.

While the other options also relate to the mouth in some way, they pertain to more specific or different anatomical aspects. For example, "or/o" is another root word for mouth but is not as broadly used in medical terms compared to "stomat/o." "Gnath/o" refers specifically to the jaw, indicating structures of the jaw rather than the overall mouth area. Lastly, "gloss/o" pertains to the tongue, focusing on that specific part of the oral cavity instead of the mouth in its entirety. Thus, "stomat/o" is the most encompassing term related to the mouth in medical terminology.