AskDefine | Define tidemark

Dictionary Definition

tidemark n : indicator consisting of a line at the high-water or low-water limits of the tides

User Contributed Dictionary




  1. a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide
  2. In the context of "by extension": 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
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