internal friction

17 LETTERS · STARTS WITH I

internal friction is a valid 17-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1T1E1R1N1A1L1F4R1I1C3T1I1O1N1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 4 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does internal friction mean?