Etymology
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jetty (n.)

early 15c., from Old French jetee, getee "a jetty, a pier; a projecting part of a building," also "a throw," noun use of fem. past participle of jeter "to throw," from Latin iacēre "to lie, rest," related to iacere "to throw" (from PIE root *ye- "to throw, impel"). The notion is of a structure "thrown out" past what surrounds it.

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Definitions of jetty

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