ureter

This anatomical term refers specifically to the conduit between the kidney and the bladder. It is distinct from the urethra, which is the tube that carries urine from the bladder to the outside of the body. Confusing these two terms is a common error in non-medical contexts. As a biological structure, it is a countable noun. In medical reports, it is frequently used in the singular when referring to a specific side of the body or in the plural when discussing the bilateral system of the urinary tract.