miz·zen·mast /-ˌmæst, məst/
  後桅
  Miz·zen·mast n. Naut. the third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy. 
  Note: The definition varies slightly with the dictionary; in some dictionaries it is the last mast of a three-masted vessel; in others, it is the mast after the mainmast  of a vessel of three or more masts. PJC.
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  mizzenmast
       n : third mast from the bow in a vessel having three or more
           masts; the after and shorter mast of a yawl, ketch, or
           dandy [syn: mizenmast, mizzen, mizen]