Jetty

[jet-ee] /ˈdʒɛt i/

noun, plural jetties.
1.
a pier or structure of stones, piles, or the like, projecting into the sea or other body of water to protect a harbor, deflect the current, etc.
2.
a wharf or landing pier.
3.
the piles or wooden structure protecting a pier.
4.
Also, jutty. an overhang, as of an upper story beyond a lower.
verb (used with object), jettied, jettying.
5.
to construct (part of a building) so that it projects beyond lower construction; jutty.
[jet-ee] /ˈdʒɛt i/
adjective
1.
made of .
2.
resembling jet, especially in color; of a deep black.
/ˈdʒɛtɪ/
noun (pl) -ties
1.
a structure built from a shore out into the water to direct currents or protect a harbour
2.
a landing pier; dock
/ˈdʒɛtɪ/
adjective
1.
of or resembling jet, esp in colour or polish
n.

early 15c., from Old French jetee “a jetty, a projecting part of a building,” also “a throw,” noun use of fem. past participle of jeter “to throw” (see jet (v.)). Notion is of a structure “thrown out” past what surrounds it.