1. A line marking the level reached by a body of water
   "The flood left a watermark on the walls of the basement";
   - water line
    
2. A distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light
   "The genuine currency had a distinct watermark when held up to the light"

1. Mark with a watermark
   "They watermarked all official documents to prevent forgery"

Derived forms: watermarks, watermarking, watermarked

Type of: line, mark, marker, marking

Encyclopedia: Watermark