† pseudochromian. [ < pseudo-comb. form + ancient Greek χρῶμα colour (see chromen.) + -iasuffix1 (compare -chromycomb. form)] MedicineObsoleterare total inability to distinguish colours; = achromatopsian.Apparently only attested in dictionaries or glossaries.
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1857 R. DunglisonMed. Lexicon (rev. ed.) 766/1Pseudochromia, achromatopsia.