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]WordNet (r) 3.0 (2006):
paddle box n 1: a wooden covering for the upper part of a paddlewheel [syn: paddle box, paddle-box]