From International Dictionary of Marine Aids to Navigation
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Alternative term: Groin

A structure extending into the sea from a beach or bank, designed to prevent littoral drift.

Note: The French term epi and the German term Buhne are also used for structures extending into rivers or estuaries, designed to restrict the cross-sectional area of the water flow.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM