tidemark ( synonym found)

Definition of tidemark:

(n) : a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide; any mark showing the limit of some past activity

Definition of tidemark:

(n) : a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide; any mark showing the limit of some past activity

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