Etymology
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discolour (v.)

chiefly British English spelling of discolor (q.v.); for ending see -or. Related: Discoloured; discolouring; discolouration.

updated on January 02, 2013

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Definitions of discolour from WordNet

discolour (v.)
change color, often in an undesired manner;
Synonyms: discolor / colour / color
From wordnet.princeton.edu, not affiliated with etymonline.