visibility curve

16 LETTERS · STARTS WITH V

visibility curve is a valid 16-letter word worth 28 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

V4I1S1I1B3I1L1I1T1Y4C3U1R1V4E1

4 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 4 + 0 + 3 + 1 + 1 + 4 + 1 =28 PTS

DOUBLE WORD → 56TRIPLE WORD → 84

MEANING

What does visibility curve mean?