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groyne (n.)

"strong, low sea wall," 1580s, perhaps from obsolete groin "pig's snout" (c. 1300; the wall so called because it was thought to look like one), from Old French groin "muzzle, snout; promontory, jutting part," from Latin grunnire "to grunt" (compare English colloquial grunter "a pig").

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Definitions of groyne from WordNet

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