mizzen
noun
[ ˈmɪz(ə)n ]
• the mast aft of a ship's mainmast.
• a sail on the mizzenmast of a ship, in particular the lowest sail on the mizzenmast of a square-rigged sailing ship.
• "mizzen yard"
Origin:
late Middle English: from Italian mezzana ‘mizzensail’, feminine (used as a noun) of mezzano ‘middle’, from Latin medianus (see median).