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seamark

noun
sea·​mark | \ ˈsē-ˌmärk How to pronounce seamark (audio) \

Definition of seamark

1 : a line on a coast marking the tidal limit
2 : an elevated object serving as a beacon to mariners

First Known Use of seamark

15th century, in the meaning defined at sense 1

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The first known use of seamark was in the 15th century

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