An aquaduck, are huge structures that the Romans used to get water from place to place in Medieval London.
an aquaduck
Isn't that an Aquaduck?
There are only aquaducks on the Dream and Fantasy boats. The aqua duck is 765 feet long.
Firstly, it is spelled aqueduct. Secondly, you are correct. It is device used for giving fresh, clean water over a great length made by the Romans.