English

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

 

lanthanum

 noun
noun
BrE BrE//ˈlænθənəm//
 
; NAmE NAmE//ˈlænθənəm//
 
[uncountable] (symbol La)
 
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a chemical element. Lanthanum is a silver-white metal. Word Origin mid 19th cent.: from Greek lanthanein ‘escape notice’ (because for a long time it was undetected in cerium oxide) + -um.
See the Oxford Advanced American Dictionary entry: lanthanum