World English Dictionary
aluminium or (US), (Canadian) aluminum (ˌæljʊˈmɪnɪəm, əˈluːmɪnəm)
a light malleable ductile silvery-white metallic element that resists corrosion; the third most abundant element in the earth's crust (8.1 per cent), occurring only as a compound, principally in bauxite. It is used, esp in the form of its alloys, in aircraft parts, kitchen utensils, etc. Symbol: Al; atomic no: 13; atomic wt: 26.9815; valency: 3; relative density: 2.699; melting pt: 660.45°C; boiling pt: 2520°C
aluminum or (US), (Canadian) aluminum

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Aluminium has a reputation for not rusting but it does oxidise on the surface.
Aluminium has rightly been called metallic electricity.
Aluminium plays an important part in the action of many vaccines.
When aluminium pans became popular, stewing rhubarb was discovered to have
  another bonus: it cleaned the pans beautifully.
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