A structure that extends into water, usually made of concrete or stone, used to protect a harbor or allow boats to dock.
From Old French 'jetée,' the past participle of 'jeter' meaning 'to throw.' Literally, a jetty is something 'thrown out' into the water, as builders dump stone and earth to create the structure.
The word 'jetty' perfectly captures the construction method—you literally throw tons of rocks and stone into the water to build a barrier or dock, and the word itself comes from that throwing motion!
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