paddle-box

from WordNet (r) 3.0 (2006)

paddle-box
    n 1: a wooden covering for the upper part of a paddlewheel [syn:
         {paddle box}, {paddle-box}]

from The Collaborative International Dictionary of English v.0.48

paddlebox \paddlebox\, paddle box \paddle box\n.
   1. a wooden covering for the upper part of the paddle wheel
      of a steam vessel.
      [1913 Webster + WordNet 1.5]