double genitive

15 LETTERS · STARTS WITH D

double genitive is a valid 15-letter word worth 21 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

D2O1U1B3L1E1G2E1N1I1T1I1V4E1

2 + 1 + 1 + 3 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 1 + 1 + 4 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does double genitive mean?