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Waterline

//ˈwɔːtə(ɹ)laɪn// noun

Noun

1
A line formed by the surface of the water on the hull of a ship when she is afloat; any of a series of short lines marked on the hull to show where the waterline would be under different loadings
2
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 wordnet
3
A horizontal line indicating the shape of an airfoil.
4
A line showing where the water has been, usually a line separating dry land and wet areas; a watermark or tidemark.
"Down here along the waterline, the Enterprise has a belt of thick antitorpedo armor. It's not too promising."
5
The inner rim of the eyelid, just behind the lash line; primarily used in reference to the application of eyeliner.

From water + line.

Unscramble this word: waterline