gangboard

from WordNet (r) 3.0 (2006)

gangboard
    n 1: a temporary bridge for getting on and off a vessel at
         dockside [syn: {gangplank}, {gangboard}, {gangway}]

from The Collaborative International Dictionary of English v.0.48

gangboard \gangboard\, gang board \gang board\n.
   a temporary bridge for getting on and off a vessel at
   dockside.

   Syn: gangplank, gang plank, gangway.
        [WordNet 1.5]