Definition of jackyard in English:

jackyard

noun

Nautical
  • On a fore-and-aft rigged vessel, especially a yacht: a light spar extending above the top of the mast or beyond the end of the gaff so as to enable a larger topsail to be set.

Origin

Mid 19th century; earliest use found in Hunt's Yachting Magazine. From Jack + yard.

Pronunciation

jackyard

/ˈdʒakjɑːd/