Definition of polychromatize in US English:

polychromatize

(also polychromatise)

verb

rare
  • with object To paint or adorn (a surface) with many colours. Usually in pass.

Origin

Mid 19th century; earliest use found in The Builder: an illustrated weekly magazine. From polychromat- + -ize.

Pronunciation

polychromatize

/ˌpɒlɪˈkrəʊmətʌɪz/