uropod

This term is a specialized anatomical descriptor used primarily in carcinology and zoology. It refers specifically to the paired appendages at the end of the abdomen in crustaceans, which work in tandem with the telson to create the tail fan. This structure is critical for the "caridoid escape reaction," allowing the animal to propel itself backward rapidly.

Because it is a technical biological term, it is almost exclusively found in scientific literature, academic textbooks, or taxonomic descriptions. It is not used in general conversation or non-scientific contexts.