Hypertext Webster Gateway: "Frictional"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Frictional \Fric"tion*al\, a.
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) 1.7 (wn)
frictional
adj : pertaining to or worked or produced by friction; "frictional
electricity"; "frictional heat"; "frictional gearing"
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