waterline
/ˈwɔt̬ərlaɪn/
noun
- The line on a ship or boat where the surface of the water meets the hull.
- The captain checked the waterline to see how heavily the ship was loaded.
- Algae grew along the waterline of the old fishing boat.
- The paint below the waterline is specially designed to resist corrosion.
- The level reached by the surface of a body of water, especially as a mark on a structure.
- The flood left a dark waterline on the walls of the basement.
- They measured the waterline on the dock to track the tide.
- The reservoir's waterline dropped significantly during the summer drought.