[mass noun]a precious stone consisting of a violet or purple variety of quartz 紫晶,紫石英 ■a violet or purple colour 一种紫罗兰色 [as modifier]an amethyst dress. 一件紫色裙子。
派生 amethystine [-ˈθɪstiːn] adjective 语源
Middle English : via Old French from Latin amethystus, from Greek amethustos 'not drunken' (because the stone was believed to prevent intoxication)