When the waves reached their violent peak, a BUD/S instructor standing on top of the jetty would signal with his flashlight.
The Daily Pic: Robert Smithson found spirals before his "jetty".
From these homes one can see the lighthouse, the jetty, some small islands, but nothing more.
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.