Etymology
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breakwater (n.)

"any structure serving to break the force of waves and protect a harbor or shore," 1721, from break (v.) + water (n.1).

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Definitions of breakwater

breakwater (n.)
a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away;
Synonyms: groin / groyne / mole / bulwark / seawall / jetty
From wordnet.princeton.edu