[jet.ty] n, pl jetties [ME jette, fr. MF jetee, fr. fem. of jete, pp. of jeter to throw--more at jet] (15c) 1 a: a structure extended into a sea, lake, or river to influence the current or tide or to protect a harbor b: a protecting frame of a pier
2: a landing wharf
[2]jetty vi jet.tied ; jet.ty.ing (1598): project, jut [3]jetty adj (1586): black as jet