Learn how to say Mizzenmast correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word mizzen:
1 (also mizzenmast) the mast aft of a ship’s mainmast.
2 (also mizzensail) a sail on the mizzenmast of a ship, in particular the lowest sail on the mizzenmast of a square-rigged sailing ship:
late Middle English: from Italian mezzana ‘mizzensail’, feminine (used as a noun) of mezzano ‘middle’, from Latin medianus (see median)