The Collaborative International Dictionary of English v.0.48:

Stevedore \Ste"ve*dore`\, n. [Sp. estivador a packer, a stower,
   fr. estivar to pack, to stow, L. stipare to press, compress,
   probably akin to E. stiff. See Stiff, Stive to stuff.]
   One whose occupation is to load and unload vessels in port;
   one who stows a cargo in a hold.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stevedore
    n 1: a laborer who loads and unloads vessels in a port [syn:
         stevedore, loader, longshoreman, docker,
         dockhand, dock worker, dockworker, dock-walloper,
         lumper]