Which term means "mouth" or "orifice" in medical terminology?

The term that means "mouth" or "orifice" in medical terminology is "os." In various anatomical contexts, "os" is often used to refer to an opening, such as the opening of a canal or a body cavity. For example, "os" can be found in terms like "ostium," which refers to an opening in a structure. This usage is derived from Latin, where "os" directly translates to "mouth."

Keloid refers to a type of raised scar that forms at the site of a healed skin injury, adenopathy describes an enlargement of the lymph nodes, and ischemia refers to a reduction in blood supply to a tissue. Each of these terms is specific to certain medical conditions and does not refer to an anatomical opening or orifice. This distinction underscores why "os" is the term that correctly translates to "mouth" or "orifice."