<p><strong>Noun</strong></p><ul><li>Nautical: a drain at the edge of a deck exposed to the weather, for allowing accumulated water to drain away into the sea or into the bilges</li><li>a drain, closed by one or two flaps, for allowing water from the sprinkler system of a factory or the like to run off a floor of the building to the exterior</li><li>any opening in the side of a building, as in a parapet, for draining off rainwater</li></ul>