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

selenium

noun
 
/səˈliːniəm/
 
/səˈliːniəm/
[uncountable]
(symbol Se)
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  1. 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 Originearly 19th cent.: modern Latin, from Greek selēnē ‘moon’.
See selenium in the Oxford Advanced American Dictionary
Check pronunciation: selenium

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