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

 

alumina

 noun
noun
BrE BrE//əˈluːmɪnə//
 
; NAmE NAmE//əˈluːmɪnə//
 
[uncountable] (specialist)
 
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a white substance found in many types of rock, especially clay Word Origin late 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