surface measure

15 LETTERS · STARTS WITH S

surface measure is a valid 15-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1U1R1F4A1C3E1M3E1A1S1U1R1E1
1 + 1 + 1 + 4 + 1 + 3 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does surface measure mean?

1