tidemark
- Noun. a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide.
- Noun. (context, by extension) any mark showing the limit of some past activity.
- Noun. (humorous) a line of scum left on a bath tub when the water is drained away.
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This entry was last updated on RefTopia from its source on 3/20/2012.