The word "ureter" comes from the Ancient Greek stem "uro" relating to urination, and the first use of the word is seen during the era of Hippocrates to refer to the urethra. The anatomical structure of the ureter was noted by 40 AD. However, the terms "ureter" and "urethra" were variably used to refer to each other thereafter for more than a millennium. It was only in the 1550s that anatomists such as Bartolomeo Eustacchio and Jacques Dubois began to use the terms to specifically and consistently refer to what is in modern English called the ureter and the urethra. Following this, in the 19th and 20th centuries multiple terms relating to the structures such as ureteritis and ureterography, were coined.