seabank

plural seabanks

1. A bank or mole to defend against the sea.

   Typically, aerial photography of areas of seabanks shows a complex pattern of banks and counter-walls […]

   2009, Peter Murphy, The English Coast: A History and a Prospect, page 55

   1 more example

   So strong is the barrier which these sea-borne sands oppose to the river-borne ooze, that as soon as a seabank is built — as the projectors of the Victoria County have built them — across any part of the estuary, the mud caught by it soon 'warps' the space within into firm and rich dry land.

   c. 1860, Charles Kingsley, The Fens

2. The seashore.