English

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

 

lithium

 noun
noun
BrE BrE//ˈlɪθiəm//
 
; NAmE NAmE//ˈlɪθiəm//
 
[uncountable] (symbol Li)
 
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a chemical element. Lithium is a soft, very light, silver-white metal used in batteries and alloys. Word Origin early 19th cent.: from lithia ‘lithium oxide’ + -ium.
See the Oxford Advanced American Dictionary entry: lithium