decolorise

VERB /di'kələ,raɪz/
10 LETTERS · 4 SYLLABLES · STARTS WITH D

decolorise is a valid 10-letter word worth 13 points in Scrabble and 15 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2E1C3O1L1O1R1I1S1E1
2 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =13 PTS
DOUBLE WORD → 26TRIPLE WORD → 39
MEANING

What does decolorise mean?