Definition from Wiktionary, the free dictionary
groyne (plural groynes)
- A (usually wooden) structure that projects from a coastline to prevent erosion, longshore drift etc.; a breakwater
1993, Will Self, My Idea of Fun:
- Our assimilation into one another had been beautifully timed, with each little revelation of unpleasantness acting as a modest baffler, a groyne to our mutual inundation. Now all of this was going to be flooded, drenched in poisonous ichor.