Tidemark Definition

tīdmärk

noun

A mark indicating the highest point of flood tide or, sometimes, the lowest point of ebb tide.

Webster's New World

A trace or indication of past activity.

American Heritage

(by extension) Any mark showing the limit of some past activity.

Wiktionary

(humorous) A line of scum left on a bath tub when the water is drained away.

Wiktionary

Other Word Forms of Tidemark

Singular:

tidemark

Plural:

tidemarks

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