Definitions from Wiktionary ( )

▸ noun:  (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.
▸ noun:  (aviation) A horizontal line indicating the shape of an airfoil.
▸ noun:  A line showing where the water has been, usually a line separating dry land and wet areas; a watermark or tidemark.
▸ noun:  (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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