film speed

10 LETTERS · STARTS WITH F

film speed is a valid 10-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

F4I1L1M3S1P3E1E1D2

4 + 1 + 1 + 3 + 0 + 1 + 3 + 1 + 1 + 2 =17 PTS

DOUBLE WORD → 34TRIPLE WORD → 51

MEANING

What does film speed mean?