Which prefix refers to the mouth or oral region?

The prefix that refers to the mouth or oral region is "Or-." This prefix is derived from the Latin word "os," which means mouth. It is commonly used in medical terminology to denote anything related to the oral cavity. For example, terms like "oral" and "oropharynx" incorporate this prefix to indicate anatomical structures or functions associated with the mouth.

In contrast, "naso-" pertains specifically to the nose, highlighting its connection to nasal anatomy, while "pneumo-" relates to the lungs or air, primarily used in terms pertaining to respiratory conditions. "Gastro-" refers to the stomach or digestive tract, illustrating a focus on the gastrointestinal system rather than the oral cavity. Each of these prefixes serves a distinct purpose in medical language, but "Or-" is specifically connected to the mouth.