The Collaborative International Dictionary
Polychromy
Polychromy \Pol"y*chro`my\, n. [Poly- + Gr. ? color.] (Anc. Art) The art or practice of combining different colors, especially brilliant ones, in an artistic way.
Wiktionary
polychromy
n. The art or practice of combining different colors, especially brilliant ones, in an artistic way.