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Definition of Tidemark
1. Noun. Indicator consisting of a line at the highwater or low-water limits of the tides. 
Generic synonyms: Indicator
Definition of Tidemark
1. a mark showing the highest or lowest point of a tide [n -S]
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1. Noun. Indicator consisting of a line at the highwater or low-water limits of the tides. 
1. a mark showing the highest or lowest point of a tide [n -S]