indigo auxiliary

16 LETTERS · STARTS WITH I

indigo auxiliary is a valid 16-letter word worth 27 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1D2I1G2O1A1U1X8I1L1I1A1R1Y4

1 + 1 + 2 + 1 + 2 + 1 + 0 + 1 + 1 + 8 + 1 + 1 + 1 + 1 + 1 + 4 =27 PTS

DOUBLE WORD → 54TRIPLE WORD → 81

MEANING

What does indigo auxiliary mean?