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n. pl. jet·ties
1. A structure, such as a pier, that projects into a body of water to influence the current or tide or to protect a harbor or shoreline from storms or erosion.
2. A wharf.
[Middle English getti, jettie, from Old French jetee, from feminine past participle of jeter, to project, throw; see jet2.]
1. Resembling jet, as in texture.
2. Of the color jet; black: jetty tresses.