What is the Latin word for tail?

The Latin word for "tail" is indeed "Cauda." In biological and anatomical contexts, "cauda" is used to describe the tail-like structures in various organisms. This term is not only significant in veterinary medicine and zoology but also commonly appears in discussions about anatomy across multiple species.

The other options refer to different anatomical or biological terms. "Aurus" does not signify any anatomical part but is not related to the concept of a tail. "Rostrum" typically refers to a beak or snout in animals, particularly in the context of birds or crustaceans, and does not relate to the tail. "Appendix" refers more commonly to an appendage or a specific part of the gastrointestinal system in humans, rather than to a tail. Understanding these terms and their meanings can be vital in fields such as veterinary medicine, where precise language is essential for clear communication about anatomy and physical structures.