Having the color, nature, or properties of amethyst, a purple or violet gemstone; resembling amethyst.
From 'amethyst' + '-ine' (adjective suffix). Amethyst itself comes from Greek 'a-' (not) + 'methuskein' (to intoxicate), as ancients believed it prevented drunkenness. The '-ine' suffix was added in English to form color and quality adjectives.
Ancient Greeks wore amethyst rings believing they'd stay sober while drinking wine, leading them to name the stone 'amethystine'—unfortunately it doesn't actually work, but you can still get the pretty purple color without the magical hangover protection.
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