Where does “discoloured” come from?

Discoloured comes from Middle English dis- (prefix meaning "not" or "reverse") combined with coloured, ultimately tracing through Latin dis- and Latin ex to the Proto-Indo-European root dwóh₁ meaning "two," reflecting the sense of separation or division.

discoloured (English): Britain standard spelling of discolored; simple...

Definitions

Britain standard spelling of discolored; simple...

Ancestry of “discoloured”, step by step

Step	Language	Word	Meaning
1	English	dis-	reversal or removal; apart; Used as an...
2	Middle English	dis-	dis-, de
3	Old French	des-	de-; dis-
4	Latin	dis-	asunder, apart, in two; reversal, removal;...
5	Latin	calceus	shoe
6	Latin	calx	limestone; chalk; the finish line
7	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

Every word from Ancient Greek χάλιξ →Every word from Latin dis- →Every word from Latin calx →