breakwater

n. pier, quay; barrier which breaks the force of waves

Breakwater has several meanings, including:Breakwater (structure), a structure for protecting a beach or harbourBreakwater, Victoria, a suburb of Geelong, Victoria, AustraliaBreakwater School, a Portland, Maine, pre-school and elementary school founded in 1956 Breakwater (Lennie Gallant album), from 1988Breakwater (band), a funk and soul band from the 1980s Breakwater Abu Dhabi Corniche
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Noun
1. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
(synonym) groin, groyne, mole, bulwark, seawall, jetty
(hypernym) barrier

(n.)
Any structure or contrivance, as a mole, or a wall at the mouth of a harbor, to break the force of waves, and afford protection from their violence.
  

A structure built to break the force of waves so as to protect a beach, harbor, or other waterfront facility. (DOI4)