ultraviolet illumination

NOUN
24 LETTERS · STARTS WITH U

ultraviolet illumination is a valid 24-letter word worth 28 points in Scrabble and 38 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
U1L1T1R1A1V4I1O1L1E1T1I1L1L1U1M3I1N1A1T1I1O1N1
1 + 1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =28 PTS
DOUBLE WORD → 56TRIPLE WORD → 84
MEANING

What does ultraviolet illumination mean?

NOUN · 1 SENSE
1

Radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays.