background radiation

NOUN
20 LETTERS · STARTS WITH B

background radiation is a valid 20-letter word worth 30 points in Scrabble and 36 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3A1C3K5G2R1O1U1N1D2R1A1D2I1A1T1I1O1N1
3 + 1 + 3 + 5 + 2 + 1 + 1 + 1 + 1 + 2 + 0 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 1 =30 PTS
DOUBLE WORD → 60TRIPLE WORD → 90
MEANING

What does background radiation mean?

NOUN · 1 SENSE
1

Radiation coming from sources other than those being observed.