waterstop noun2 •A waterproof barrier that is used to prevent moisture from leaking through a joint.A waterstop, which is installed before pouring the concrete, may be effective in sealing joints, but is not applicable for cracks. — 2010 •A location along a waterway where a water taxi, riverboat, or similar form of transportation makes a regular stop to load and unload passengers or cargo.The barge pulled up at the waterstop; she allowed the young men to leave first and then followed them up the incline to Greenwich Palace. — 2009 formswaterstops
