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achromatism▼◼◼◼(achromatopia)noun[UK: ə.ˈkrəʊ.mə.tɪzm] [US: eɪˈkro.ʊ.mə.tɪ.zəm]
tetrachromacy▼◼◼◼(having four independent channels for conveying color in the eye)noun
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