Waterline (noun)

The line marking the surface of the water on the hull of a ship or boat.

Origin:

From the english word 'water' and the middle english word 'line' meaning 'a continuous mark'.

Examples:

1. The waterline was used to determine the ship's stability and to monitor for any leaks or breaches.
2. The waterline was visible from the shore, the outline of the boat appearing to float on the surface of the water.
3. The waterline was a crucial reference point for sailors, helping to guide the ship and avoid obstacles.
4. The waterline was marked with a bright paint, making it easier to see and distinguish from the rest of the hull.
5. The waterline was an important factor in the design of the boat, affecting its speed, efficiency, and overall performance.