stone proof

11 LETTERS · STARTS WITH S

stone proof is a valid 11-letter word worth 15 points in Scrabble and 17 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1T1O1N1E1P3R1O1O1F4

1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 4 =15 PTS

DOUBLE WORD → 30TRIPLE WORD → 45

MEANING

What does stone proof mean?