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The Collaborative International Dictionary
Frictional

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.

Wiktionary
frictional

a. Relating to, or caused by, friction.

WordNet
frictional

adj. pertaining to or worked or produced by friction; "frictional electricity"; "frictional heat"; "frictional gearing"

Wikipedia

Usage examples of "frictional".

Frictional heating surrounded the racing orbiter with a blaze of ionized gases.

Most men recognize this first contraction as the point of ejaculatory inevitability and take this as an intuitive signal to increase frictional massage of the frenulum and glans and tighten the grip on the base and shaft.

The asymmetry of the crystal, due to a one-sided working of the forces of crystallization, plays the same role here as does the alchemic opposition between the two bodies used for the production of frictional electricity.

If such a contract had specified a fifty-fifty split, then x would be equal to fifty percent of the cash value of the wreck times the one tenth of Epiphyte that the Dentist owns minus a few percent for taxes and other frictional effects of the real world.

Just as in the case of frictional electricity, the kind of electricity which is supplied by a certain metal depends on whether the other metal with which it is coupled stands to the right or to the left of it in the series.

Besides, all you'd be doing would be to send the rollers to their frictional base states, and they become like superslippery bald tires.

You'll have frictional losses, effects of the solar magnetic field, all that sort of thing working against you.