jetty

Etymology 1

From French jetée (“pier, jetty, causeway”), from jeter. Compare jet, jutty.

noun

1. A structure of wood or stone extended into the sea to influence the current or tide, or to protect a harbor or beach.
2. A dock or wharf extending from the shore; a pier.
3. (architecture) A part of a building that jets or projects beyond the rest, and overhangs the wall below.

verb

1. (obsolete, intransitive) To jut out; to project.
   ADENTELLARE […] It is properly to jetty out, or indent stones or timber of any unfinished building, that another may the easier be joyned unto, or that finished. 1598, John Florio, A Worlde of Wordes, or Dictionarie of the Italian and English tongues

Etymology 2

jet + -y

adj

1. (archaic) Made of jet, or like jet in color.
   those large black eyes were so blackly fringed, / The glossy rebels mocked the jetty stain …. 1819, Lord Byron, Don Juan, III.75
   She raised her face veil […] showing two black eyes fringed with jetty lashes, whose glances were soft and languishing and whose perfect beauty was ever blandishing […] 1885, Sir Richard Burton, The Book of the Thousand Nights and One Night, volume 1