Meaning

noun a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away

originThe noun is derived from Late Middle English gete, jette, jetti (“projecting upper storey of a building, overhang; breakwater, pier, jetty”), from Anglo-Norman geté, getee, getté, and Middle French geté, getee, jeté (“projecting upper storey of a building; breakwater, pier”) (modern French jetée), a noun use of the past participle of geter, jeter, from Old French geter, jeter (“to throw”) from…

Etymology from Wiktionary, CC BY-SA 3.0