achromatic (adj.)youdaoicibaDictYouDict[achromatic 词源字典]
1766, from Latinized form of Greek akhromatos "colorless," from a-, privative prefix (see a- (3)), + khromat-, comb. form of khroma "color" (see chroma) + -ic.[achromatic etymology, achromatic origin, 英语词源]
achromatizeyoudaoicibaDictYouDict
"To make (something, especially a lens) achromatic", Early 19th cent.; earliest use found in Encyclopaedia Metropolitana. From achromat- + -ize.
metachromatismyoudaoicibaDictYouDict
"Change of the colour of hair, skin, etc. Now rare", Late 19th cent. From meta- + chromatism; in later use in sense 1 probably after French métachromatisme, although in quot. 1876 at sense 1b apparently an independent formation.
parachromatismyoudaoicibaDictYouDict
"Colour blindness", Mid 19th cent.; earliest use found in Richard Taylor (?1805–1873).
achromatopsiayoudaoicibaDictYouDict
"Inability to distinguish between some or (usually) all colours; absence, severe impairment, or loss of colour vision; colour blindness, especially monochromatism", Mid 19th cent.; earliest use found in The Lancet. From German Achromatopsie, †Achromatopsia from ancient Greek ἀχρώματος + Hellenistic Greek -οψία.