| 1. | Nautical. the part of the outside of a ship's hull that is just at the water level. |
| 2. | Naval Architecture. any of a series of lines on the hull plans of a vessel representing the level to which the vessel is immersed or the bottom of the keel. Compare load line, Plimsoll line. |
| 3. | the line in which water at its surface borders upon a floating body. |
| 4. | water level (def. 2). |
| 5. | Also called watermark. a line indicating the former level or passage of water: A water line all around the cellar served as a reminder of the flood. |
| 6. | a pipe, hose, tube, or other line for conveying water. |
| water line or wa·ter·line (wô'tər-līn', wŏt'ər-) n.
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