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Webster 1913 Edition

Noun.

[Obs.]

See

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.