string diapason

15 LETTERS · STARTS WITH S

string diapason is a valid 15-letter word worth 18 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1T1R1I1N1G2D2I1A1P3A1S1O1N1

1 + 1 + 1 + 1 + 1 + 2 + 0 + 2 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does string diapason mean?