decolourize

VERB /di'kələ,raɪz/
11 LETTERS · STARTS WITH D

decolourize is a valid 11-letter word worth 23 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2E1C3O1L1O1U1R1I1Z10E1
2 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 10 + 1 =23 PTS
DOUBLE WORD → 46TRIPLE WORD → 69
MEANING

What does decolourize mean?