brain disease

NOUN /breɪn_dɪ'ziz/
13 LETTERS · STARTS WITH B

brain disease is a valid 13-letter word worth 15 points in Scrabble and 17 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3R1A1I1N1D2I1S1E1A1S1E1
3 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 1 + 1 + 1 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does brain disease mean?