monochrome (n.)youdaoicibaDictYouDict[monochrome 词源字典]
1660s, "painting or drawing done in different tints of a single color," from Greek monochromos "of a single color," from monos "single, alone" (see mono-) + khroma (genitive khromatos) "color, complexion, skin" (see chroma). As an adjective from 1849. Photographic sense is recorded from 1940.[monochrome etymology, monochrome origin, 英语词源]