nondistinguishable

18 LETTERS · 6 SYLLABLES · STARTS WITH N

nondistinguishable is a valid 18-letter word worth 25 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

N1O1N1D2I1S1T1I1N1G2U1I1S1H4A1B3L1E1

1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 4 + 1 + 3 + 1 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does nondistinguishable mean?