# waterline

> English word · Noun · IPA /ˈwɔːtə(ɹ)laɪn/ · frequency rank #45,742

## Definitions
1. 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
2. A horizontal line indicating the shape of an airfoil.
3. A line showing where the water has been, usually a line separating dry land and wet areas; a watermark or tidemark.
4. The inner rim of the eyelid, just behind the lash line; primarily used in reference to the application of eyeliner.

## Etymology
From water + line.

## Easily confused with
- **waterside** (https://plainspell.com/en/vs/waterline-vs-waterside)
- **watering** (https://plainspell.com/en/vs/watering-vs-waterline)

## Common misspellings (13)
`awterline`, `waetrline`, `watelrine`, `waterilne`, `waterlien`, `waterlinne`, `waterlline`, `waterlnie`, `waterrline`, `watreline`, `watterline`, `wtaerline`, `wwaterline`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/waterline