meth·yl·ated spiritBrE /ˌmeθəleɪtɪd ˈspɪrɪt/ 🔊NAmE /ˌmeθəleɪtɪd ˈspɪrɪt/ 🔊 (also meth·yl·ated spirits) (also informal meths) noun [uncountable] a type of alcohol that is not fit for drinking, used as a fuel for lighting and heating and for cleaning off dirty marks 变性酒精，甲基化酒精（不适宜饮用，用作照明、加热燃料或清洗剂）