annihilation radiation

22 LETTERS · STARTS WITH A

annihilation radiation is a valid 22-letter word worth 25 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

A1N1N1I1H4I1L1A1T1I1O1N1R1A1D2I1A1T1I1O1N1

1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does annihilation radiation mean?