The Collaborative International Dictionary of English v.0.48:

Shole \Shole\, n.
   A plank fixed beneath an object, as beneath the rudder of a
   vessel, to protect it from injury; a plank on the ground
   under the end of a shore or the like.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shole \Shole\, n.
   See Shoal. [Obs.]
   [1913 Webster]