resistance derivative

21 LETTERS · STARTS WITH R

resistance derivative is a valid 21-letter word worth 29 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1E1S1I1S1T1A1N1C3E1D2E1R1I1V4A1T1I1V4E1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 1 + 0 + 2 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 4 + 1 =29 PTS

DOUBLE WORD → 58TRIPLE WORD → 87

MEANING

What does resistance derivative mean?