1) Brig structure 2) Ketch structure 3) Mast 4) Mizen 5) Mizenmast 6) Mizzen 7) Ship pole 1) Mizen 2) Mizenmast 3) Mizzen 
mast aft or next aft of the mainmast in a ship
mast aft or next aft of the mainmast in a ship
• (n.) The hindmost mast of a three-masted vessel, or of a yawl-rigged vessel.
(from the article `sail`) ...location are important. Starting at the bow in a two-masted vessel, the masts are termed the foremast and the mainmast; when the aftermast is ...
Miz'zen·mast noun (Nautical) The hindmost mast of a three-masted vessel, or of a yawl-rigged vessel. 
Aboard the three-masted Concordia, the aft most of the three
(or Mizzen) The third mast on a ship.
[n] - third mast from the bow in a vessel having three or more masts
mizenmast noun third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy
The largest and, perhaps, most important mast located in the mizzen; the third mast or the mast aft of a mainmast on a ship having three or more masts.