# tidemark

> English word · Noun

## Definitions
1. a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide
2. any mark showing the limit of some past activity
3. a line of scum left on a bath tub when the water is drained away

## Etymology
From tide + mark.

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