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

 

magnesium

 noun
noun
BrE BrE//mæɡˈniːziəm//
 
; NAmE NAmE//mæɡˈniːziəm//
 
[uncountable](symbol Mg)
 
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a chemical element. Magnesium is a light, silver-white metal that burns with a bright white flame.
See the Oxford Advanced American Dictionary entry: magnesium