exact differential

18 LETTERS · STARTS WITH E

exact differential is a valid 18-letter word worth 33 points in Scrabble and 36 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

E1X8A1C3T1D2I1F4F4E1R1E1N1T1I1A1L1

1 + 8 + 1 + 3 + 1 + 0 + 2 + 1 + 4 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =33 PTS

DOUBLE WORD → 66TRIPLE WORD → 99

MEANING

What does exact differential mean?