From International Dictionary of Marine Aids to Navigation
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A flexible layer of fascines, geotextiles, or other material used to reinforce a waterlogged soil, or used on a river or sea bed to prevent scour, overlaid with rocks and stones to retain it in position.

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