Epithelial ducts are tube-like structures that transport fluid, waste, and other substances throughout the body. They are an essential part of various bodily systems, including the digestive, urinary, and reproductive system. There are many different synonyms for the word "epithelial duct", including canals, channels, tubes, passages, tracts, and conduits. Each of these synonyms emphasizes the functional nature of these structures in transporting substances. While some of these terms are more commonly associated with specific types of ducts, such as the urinary tract or the digestive canal, they can all be used to refer to the general concept of a duct within the body.