| seawall | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: breakwater, bulwark, groin, groyne, jetty, mole |
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| seaward | (noun) the direction toward the sea | - |
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| seawater | (noun) water containing salts | Synonyms: brine, saltwater |
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| seaway | (noun) a lane at sea that is a regularly used route for vessels | Synonyms: sea lane, ship route, trade route |
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| seaweed | (noun) plant growing in the sea, especially marine algae | - |
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| seaworthiness | (noun) fitness to traverse the seas | - |
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