radioluminescent

16 LETTERS · 7 SYLLABLES · STARTS WITH R

radioluminescent is a valid 16-letter word worth 21 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1A1D2I1O1L1U1M3I1N1E1S1C3E1N1T1

1 + 1 + 2 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does radioluminescent mean?