Noun watermark has 2 senses
  1. water line, watermark - a line marking the level reached by a body of water
    --1 is a kind of line
    --1 has particulars: high-water mark; low-water mark
  2. watermark - a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light
    --2 is a kind of
    marker, marking, mark
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