negative glow

13 LETTERS · STARTS WITH N

negative glow is a valid 13-letter word worth 20 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

N1E1G2A1T1I1V4E1G2L1O1W4

1 + 1 + 2 + 1 + 1 + 1 + 4 + 1 + 0 + 2 + 1 + 1 + 4 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does negative glow mean?