From The Collaborative International Dictionary of English v.0.44 [gcide]:
Frictional \Fric"tion*al\, adjective Relating to friction; moved by friction; produced by friction; as, frictional electricity.
{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 required.
From WordNet (r) 2.0 [wn]:
adjective
1: pertaining to or worked or produced by friction; "frictional electricity"; "frictional heat"; "frictional gearing"
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