Waterline meaning

wôtərlīn
The line to which the surface of the water comes on the side of a ship or boat.
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Any of several horizontal lines marked on the side of a ship to indicate the level to which it sinks when fully or partly loaded or when not loaded, and to aid in achieving a proper trim.
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A pipe, tube, etc. for conveying water.
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(nautical) 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.
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(aviation) A horizontal line indicating the shape of an airfoil.
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A line showing where the water has been, usually a line separating dry land and wet areas; a watermark or tidemark.
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(cosmetics) The inner rim of the eyelid, just behind the lash line; primarily used in reference to the application of eyeliner.
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Origin of waterline