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

 

watermark

 noun
noun
BrE BrE//ˈwɔːtəmɑːk//
 
; NAmE NAmE//ˈwɔːtərmɑːrk//
 
, NAmE//ˈwɑːtərmɑːrk//
 
 
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a symbol or design in some types of paper, which can be seen when the paper is held against the light see also high-water mark, low-water mark
See the Oxford Advanced American Dictionary entry: watermark