AQUÆDUCT, in hydraulics and architecture, a conveyance made for carrying water from one place to another. Those of the ancient Romans were surprisingly magnificent. That which Lewis XIV. built near Maintenon, for carrying the Bucoq to Versailles, is perhaps the greatest now in the world: It is seven thousand fathoms long, with two thousand five hundred and sixty fathoms of elevation, and contains two hundred and forty-two arcades.