Etymology
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watermark (n.)

also water-mark, 1708, "distinctive mark on paper," from water (n.1) + mark (n.1). Similar formation in German wassermarke. Not produced by water, but probably so called because it looks like a wet spot. The verb is recorded from 1866. Related: Watermarked.

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Definitions of watermark

watermark (n.)
a line marking the level reached by a body of water;
Synonyms: water line
watermark (n.)
a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light;
From wordnet.princeton.edu