Definition of monochromatist in US English:

monochromatist

noun

rare
  • A painter in monochrome.

Origin

Early 19th century; earliest use found in James Barry (1741–1806), history painter, printmaker, and author. Probably alteration of monochromist after classical Latin monochrōmatos, its etymon Hellenistic Greek μονοχρώματος, or their ultimate etymon ancient Greek χρωματ-, χρῶμα: see monochromatic.

Pronunciation

monochromatist

/ˌmɒnə(ʊ)ˈkrəʊmətɪst/