Frictional is valid Scrabble Word

Is frictional a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is frictional valid Words with Friends?
Words with Friends YES

10 letters word
15 points in Scrabble
18 points in WWF

Definitions for FRICTIONAL in dictionary:

ADJECTIVE:

relating to friction
of or produced by the action of one surface or object rubbing against or moving over another
Relating to friction; moved by friction; produced by friction; as, frictional electricity.
pertaining to or worked or produced by friction

OTHER DEFINITIONS:

of or relating to friction

Words related to FRICTIONAL

friction13 frictionally20

How to use FRICTIONAL in a sentence

He demonstrated that frictional and atmospheric electricity are the same.
An Englishman devised a frictional telegraph early in the last century and endeavored to interest the Admiralty.
The frictional resistance of screw propellers is always a fruitful source of inefficiency.
This is not to say that the frictional resistance is greater in proportion to the thrust at high than at low speeds.
This was quite apart from the frictional resistance offered to the upper thread in passing over the cavity of the hook.
The advantage is that it meets the case where the salt crystals form a heavy frictional surface for wood runners.
At each end the spiral wind is doubled two turns, the second lying over the first and developing a frictional resistance similar to that of a double hitch of a rope around a post.
It seems strange that this error should have diffused itself very extensively, when it is remembered that a certain degree of roughness is essential to frictional resistance.
Eventually it will come out with a little encouragement in the way of frictional massage of the womb through the abdominal walls.
His object now is to compare frictional with voltaic electricity.

The frictional tone is chiefly due to that general attitude of blame which I have already condemned as being absurd and unjustifiable.
The rove is drawn forward by surface or frictional contact between the roll itself and a rapidly rotating drum.

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