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tetrachromist
tetrachromist n.
Brit. 
/ˈtɛtrəˌkrəʊmɪst/
, /ˈtɛtrəˌkrəʊmɪst/U.S. /ˈtɛtrəˌkroʊməst/
one who holds a theory of four colours; cf. polychromist n./ˈtɛtrəˌkroʊməst/ΘΚΠ
society > leisure > the arts > visual arts > painting and drawing > painting > art of colouring > [noun] > colourer or colourist
colourer1612
colourist1685
colourman1764
tinter1823
polychromist1842
tetrachromist1842
tonist1883
tintist1890
1842 Wornum in Smith's Dict. Grk. & Rom. Antiq. at Painting §3 Ancient tetrachromists or polychromists.
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