alumabbr.1.■alumin(i)um alum1['æləm]n.1.■【化学】2.■矾;明矾[亦称作potash alum, potassium alum]3.■[美国英语]硫酸铝( = aluminum sulphate)[不准确的误用] alum2[ə'lʌm]n.1.■[美国口语](男或女)校友,毕业生