Which one of the following word parts means "bile duct"?

The word part "cholangi-" specifically refers to the bile ducts. This prefix is derived from the Greek words "chole," meaning bile, and "angion," meaning vessel or duct. In medical terminology, the prefix is used to describe structures or conditions related to the bile ducts, which are essential for the transport of bile from the liver to the gallbladder and small intestine.

Understanding the origins and meanings of medical prefixes is important for accurately interpreting and communicating medical information. The other options have distinct meanings: "edema-" pertains to swelling caused by fluid accumulation, "cerebr-" relates to the brain, and "aur-" refers to the ear. Recognizing these root words allows healthcare professionals to form and understand medical terminology more effectively, thereby enhancing patient care and communication.