isobaric line

13 LETTERS · STARTS WITH I

isobaric line is a valid 13-letter word worth 16 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1S1O1B3A1R1I1C3L1I1N1E1

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

DOUBLE WORD → 32TRIPLE WORD → 48

MEANING

What does isobaric line mean?