Definition of tidemark noun from the Oxford Advanced Learner's Dictionary

     

    tidemark

     noun
    noun
    BrE BrE//ˈtaɪdmɑːk//
     
    ; NAmE NAmE//ˈtaɪdmɑːrk//
     
    Coastlines and the sea, Travelling by boat or ship
     
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  1. 1a line that is made by the sea on a beach at the highest point that the sea reaches See related entries: Coastlines and the sea, Travelling by boat or ship
  2. 2(British English, informal) a line that is left around the inside of a bath/ bathtub by dirty water
See the Oxford Advanced American Dictionary entry: tidemark