monochroic
/ˌmɒnə(ʊ)ˈkrəʊɪk/rare
adjective
Having or showing a single colour; monochromatic. Of a crystal: not exhibiting different colours when viewed in different directions.
Origin
Late 19th century. From ancient Greek μονόχρους of one colour + -ic. Compare earlier monochroous, and also earlier monochromic, monochromatic.