derived unit

12 LETTERS · STARTS WITH D

derived unit is a valid 12-letter word worth 16 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

D2E1R1I1V4E1D2U1N1I1T1

2 + 1 + 1 + 1 + 4 + 1 + 2 + 0 + 1 + 1 + 1 + 1 =16 PTS

DOUBLE WORD → 32TRIPLE WORD → 48

MEANING

What does derived unit mean?