col ‧ our ‧ ist BrE AmE British English , colorist American English /ˈkʌlərəst, ˈkʌlərɪst/ 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 ]
1 . technical a painter who uses colour itself as a subject of a painting
2 . someone whose job is to ↑ dye people’s hair (=change the colour)