From International Dictionary of Marine Aids to Navigation
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Timber boarding used to provide a walkway.

Note: Such a walkway may be provided over an area subject to damp or flooding, for the convenience of pedestrians, or across soft ground to provide access. Duckboards may also be used to provide access across fragile roofing.

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