What does the prefix "gastro-" refer to?

The prefix "gastro-" specifically refers to the stomach. It derives from the Greek word "gaster," which means stomach or belly. This prefix is commonly used in medical terminology to form various terms related to the stomach, such as gastritis (inflammation of the stomach lining) and gastroenterology (the study of the stomach and intestines). Understanding the meaning of this prefix is crucial for comprehending various medical terms as they relate to the digestive system. Each of the other options pertains to different anatomical structures, which is why they do not align with the definition of "gastro-".