From International Dictionary of Marine Aids to Navigation
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A structure extending into the water approximately perpendicular to a bank or a shoreline. These structures are usually arranged in groups for the protection of the coast or for regulating the width and the depth of a channel.

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