mason and dixon's line

NOUN
22 LETTERS · STARTS WITH M

mason and dixon's line is a valid 22-letter word worth 29 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3A1S1O1N1A1N1D2D2I1X8O1N1'0S1L1I1N1E1
3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 0 + 2 + 1 + 8 + 1 + 1 + 0 + 1 + 0 + 1 + 1 + 1 + 1 =29 PTS
DOUBLE WORD → 58TRIPLE WORD → 87
MEANING

What does mason and dixon's line mean?

NOUN · 1 SENSE
1

The boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War.