Source : Webster's Revised Unabridged Dictionary (1913)

Longshoreman \Long"shore`man\, n.; pl. {Longshoremen}. [Abbrev.
   fr. alongshoreman.]
   One of a class of laborers employed about the wharves of a
   seaport, especially in loading and unloading vessels.

Source : WordNet®

longshoreman
     n : a laborer who loads and unloads vessels in a port [syn: {stevedore},
          {loader}, {docker}, {dockhand}, {dock worker}, {dock-walloper},
          {lumper}]