tidemark

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

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.