col ‧ our ‧ ant BrE AmE British English , colorant American English /ˈkʌlərənt/ noun [countable]
[ Word Family: noun : COLOUR/COLOR , COLOURING/COLORING , ↑ coloration , COLOURANT/COLORANT , COLOURIST/COLORIST ; adjective : COLOURED/COLORED , discoloured/discolored, COLOURFUL/COLORFUL ≠ COLOURLESS/COLORLESS , ↑ multicoloured , COLOUR/COLOR ; verb : COLOUR/COLOR ; adverb : COLOURFULLY/COLORFULLY ≠ COLOURLESSLY/COLORLESSLY ]
a substance used to change the colour of something, especially someone’s hair SYN dye