mason and dixon line

NOUN
20 LETTERS · STARTS WITH M

mason and dixon line is a valid 20-letter word worth 28 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3A1S1O1N1A1N1D2D2I1X8O1N1L1I1N1E1
3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 0 + 2 + 1 + 8 + 1 + 1 + 0 + 1 + 1 + 1 + 1 =28 PTS
DOUBLE WORD → 56TRIPLE WORD → 84
MEANING

What does mason and dixon line mean?

NOUN · 1 SENSE
1

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