tidemark.
a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide
Meaning & usage
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
a line of scum left on a bath tub when the water is drained away
Where this word comes from
From tide + mark.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.