radioactive substance

21 LETTERS · STARTS WITH R

radioactive substance is a valid 21-letter word worth 30 points in Scrabble and 36 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1A1D2I1O1A1C3T1I1V4E1S1U1B3S1T1A1N1C3E1

1 + 1 + 2 + 1 + 1 + 1 + 3 + 1 + 1 + 4 + 1 + 0 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 3 + 1 =30 PTS

DOUBLE WORD → 60TRIPLE WORD → 90

MEANING

What does radioactive substance mean?