From The Collaborative International Dictionary of English v.0.48:

Frictional \Fric"tion*al\, a.
   Relating to friction; moved by friction; produced by
   friction; as, frictional electricity.
   [1913 Webster]

   Frictional gearing, wheels which transmit motion by surface
      friction instead of teeth. The faces are sometimes made
      more or less V-shaped to increase or decrease friction, as
      [1913 Webster]
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