isotopic isobar

15 LETTERS · STARTS WITH I

isotopic isobar is a valid 15-letter word worth 20 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1S1O1T1O1P3I1C3I1S1O1B3A1R1

1 + 1 + 1 + 1 + 1 + 3 + 1 + 3 + 0 + 1 + 1 + 1 + 3 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does isotopic isobar mean?