golfbreker

Etymology
Compound of.

Noun

 * 1) breakwater
 * 2)    built on a  to slow its erosion
 * 1)    built on a  to slow its erosion

Usage notes
The sense dam transversal to the shoreline is proscribed as a transversal dam does not protect the shore against the oncoming waves (i.e. does not break the waves), unlike a breakwater which is a dam parallel to the shoreline.