1. [ noun ] (nautical) a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship
Synonyms: water_level waterline
Related terms: line load_line
2. [ noun ] a line marking the level reached by a body of water
Synonyms: watermark
Related terms: line low-water_mark high-water_mark
Similar spelling:   waterline