mizzenmast

n.
The third mast or the mast aft of a mainmast on a ship having three or more masts.

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The noun has one meaning:

Meaning #1: third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy
  Synonyms: mizzenmast, mizzen, mizen

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