waterline
/ˈwɔːtəlaɪn/noun
1
- the level normally reached by the water on the side of a ship（船的）吃水线。
1.1
- the level reached by the sea or a river visible as a line on a rock face, beach, or riverbank水位; 海岸线。
1.2
- any of various structural lines of a ship, parallel with the surface of the water, representing the contour of the hull at various heights above the keel（船的）水平线。
2
- a linear watermark in paper（纸张上的）水印。