jetty

1 [jet-ee]
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.

Origin:
1375–1425; late Middle English get(t)ey < Old French jetee, literally, something thrown out, a projection, noun use of jetee, feminine past participle of jeter to throw; see jet1

Dictionary.com Unabridged

jetty

2 [jet-ee]
adjective
1.
made of jet.
2.
resembling jet, especially in color; of a deep black.

Origin:
1475–85; jet2 + -y1

jettiness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
jetty1 (ˈdʒɛtɪ)
 
n , 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
 
[C15: from Old French jetee projecting part, literally: something thrown out, from jeter to throw; see jet1]

jetty2 (ˈdʒɛtɪ)
 
adj
of or resembling jet, esp in colour or polish
 
'jettiness2
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

jetty
1418, from O.Fr. jetee "a jetty, a projecting part of a building," from fem. pp. of jeter "to throw" (see jet (v.)). Notion is of a structure "thrown out" past what surrounds it.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica
Encyclopedia

jetty

any of a variety of engineering structures connected with river, harbour, and coastal works designed to influence the current or tide or to protect a harbour or beach from waves (breakwater). The two principal kinds of jetties are those constructed at river mouths and other coastal entrances and those used for the berthing of ships in harbours and offshore where harbour facilities are not available. Jettylike structures may be built out at intervals from the banks of rivers where a wide channel must be narrowed to concentrate the current and thus help maintain a navigable channel. These structures-variously termed spurs, spur dikes, and groins-may also be projected from the concave side of a river to retard bank erosion.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Well you should see the fluctuating color of the jetty down here.
It offers powder white coral sands, a thatch-roofed jetty and clean bathing facilities.
The munitions exploded on the jetty and in the water near the ship.
But out across a rickety-looking wood plank jetty, there's a new beer hall that
  is attracting a different kind of customer.
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