What does seawall mean?
A seawall is a substantial barrier constructed along or near a shoreline to protect land from the destructive effects of waves, storms, and coastal flooding. It is commonly made from concrete, stone, or other durable materials and may include a promenade, wall, or embankment. The word is especially useful in discussions of coastal engineering, erosion, storm surges, and adaptation to rising sea levels. A seawall can reduce erosion and flooding at the location it protects, but its presence may alter currents and sediment movement, affecting nearby stretches of coast. It is therefore more accurate to describe it as a form of coastal defence rather than a complete solution to flooding.
nounA wall or barrier built along a shoreline to protect land from wave erosion and flooding. It may be built at the water's edge or, in some locations, some distance offshore.
- A wall or barrier built to protect a shoreline from erosion, waves, and flooding.
"The town built a sturdy seawall to protect the waterfront homes from storm surges."
"Engineers reinforced the seawall after severe storms weakened sections of the wall."
"Walkers followed the promenade beside the seawall as waves rolled in below."
Used when referring to multiple shoreline barriers.
"The coast has several seawalls protecting harbours and residential areas."
A seawall can hold back the sea, but it can also redirect its force elsewhere—a reminder that coastal protection can shift a problem rather than erase it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does seawall come from?
The word combines the Germanic element “sea” with “wall,” both of which have Old English origins: “sæ” and “w(e)all.” The compound is a transparent English formation meaning a wall used as protection from the sea. Its components and close relatives are also reflected in words such as “sea,” “seaside,” and the Latin-derived “maritime,” although these have entered English through different linguistic histories.
How seawall is actually used
The term is especially common in coastal engineering and British and American English. In British usage, “seawall” is often written as two words; American usage more commonly uses “seawall” as one word, although “sea wall” is also encountered.
Easily confused with seawall
A seawall is a barrier built along or near a shoreline, whereas a breakwater is typically an offshore structure designed to reduce wave energy before it reaches the shore.