Tidemark

Pronunciation: /ˈtiˈdəmɑɹk/

Tidemark (noun)

  1. A visible line on the ground or wall showing how high water reached at the highest point.
  2. A boundary left by past sea or tide levels, used to study changes in water height over time.

Examples

  • A water line mark stayed on the wall after the flood.
  • The water line mark showed how high the water had risen.