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

 

selenium

 noun
noun
BrE BrE//səˈliːniəm//
 
; NAmE NAmE//səˈliːniəm//
 
[uncountable](symbol Se)
 
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a chemical element. Selenium is a grey substance that is used in making electrical equipment and coloured glass. A lack of selenium in the human body can lead to illnesses such as depression. Word Origin early 19th cent.: modern Latin, from Greek selēnē ‘moon’.
See the Oxford Advanced American Dictionary entry: selenium