planet differential

19 LETTERS · STARTS WITH P

planet differential is a valid 19-letter word worth 27 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3L1A1N1E1T1D2I1F4F4E1R1E1N1T1I1A1L1

3 + 1 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 4 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =27 PTS

DOUBLE WORD → 54TRIPLE WORD → 81

MEANING

What does planet differential mean?