The Collaborative International Dictionary of English v.0.48:

Splent \Splent\ (spl[e^]nt), n.
   1. See Splent.
      [1913 Webster]

   2. See Splent coal, below.
      [1913 Webster]

   Splent coal, an inferior kind of cannel coal from Scotch
      collieries; -- called also splent, splint, and splint
      coal.
      [1913 Webster]