noun

aluminium

aluminum

This bike frame is made of aluminium.

This bike frame is made of aluminum.

Aluminium is a lightweight metal.

Aluminum is a lightweight metal.

((noun)) a chemical element Aluminum is a lightweight metal.

Synonyms: aluminum (US spelling); Related: metal, steel, titanium

From Latin 'alumen' (alum), with the '-ium' suffix common for metallic elements. The US spelling drops one 'i'.

This is the standard spelling in the UK and much of the world. The US spelling is 'aluminum'.

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