proof stress

12 LETTERS · STARTS WITH P

proof stress is a valid 12-letter word worth 16 points in Scrabble and 17 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1O1O1F4S1T1R1E1S1S1

3 + 1 + 1 + 1 + 4 + 0 + 1 + 1 + 1 + 1 + 1 + 1 =16 PTS

DOUBLE WORD → 32TRIPLE WORD → 48

MEANING

What does proof stress mean?