| n. | 1. | A mark indicating the height to which water has risen, or at which it has stood; the usual limit of high or low water. |
| 2. | A letter, device, or the like, wrought into paper during the process of manufacture. | |
| 3. | (Naut.) See Water line, 2. |
| Noun | 1. | watermark - a line marking the level reached by a body of water Synonyms: water line |
| 2. | watermark - a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light |