watermark

Noun
  1. A line marking the level reached by a body of water (synset 108696749)
    is a type of: line - a spatial location defined by a real or imaginary unidimensional extent
    subtypes:
    same as: water line
  2. A distinguishing mark impressed on paper during manufacture;
    Visible when paper is held up to the light (synset 107285598)
    is a type of: mark, marker, marking - a distinguishing symbol

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