water line or wa·ter·line 
(wôtər-līn′, wŏtər-)
(wôtər-līn′, wŏtər-)n.
1.
a. The line on the hull of a ship to which the surface of the water rises.
b. Any of several lines parallel to this line, marked on the hull of a ship, and indicating the depth to which the ship sinks under various loads.
2. A line or stain, as one left on a seawall, indicating the height to which water has risen or may rise; a watermark.
3. waterline The edge of the eyelid between the eyelashes and the eyeball: apply eyeliner to your waterline.
- Indo-European root: (s)nē-
- Indo-European root: so-
- Indo-European root: sol-
- Indo-European root: spek-
- Indo-European root: (s)pen-
- Indo-European root: spend-
- Indo-European root: sper-
- Indo-European root: sperə-
- Indo-European root: spē-
- Indo-European root: sreu-
- Indo-European root: (s)teg-
- Indo-European root: stegh-
- Indo-European root: steig-
- Indo-European root: steigh-
- Indo-European root: stel-
- Indo-European root: (s)tenə-
- Indo-European root: ster-
- Indo-European root: ster-
- Indo-European root: ster-
- Indo-European root: streb(h)-
- Indo-European root: streig-
- Indo-European root: stā-
- Indo-European root: stāi-
- Indo-European root: s(w)e-
- Indo-European root: sweid-