Definition of alumina noun from the Oxford Advanced Learner's Dictionary



BrE BrE//əˈluːmɪnə//
; NAmE NAmE//əˈluːmɪnə//
[uncountable] (specialist)
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a white substance found in many types of rock, especially clay Word Originlate 18th cent.: from Latin alumen, alumin- related to aluta ‘a kind of leather’, on the pattern of words such as magnesia.
See the Oxford Advanced American Dictionary entry: alumina