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altimeter
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alumina

a·lu·mi·na [ ə lmənə ]


noun 
Definition:
 
oxide of aluminum: a white or colorless oxide of aluminum. Source: corundum, bauxite. Use: catalysts, abrasives, manufacture of artificial rubies and sapphires. Al2O3

[Late 18th century. < Latin alumin- (see aluminum), after words such as soda and magnesia]
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