selenium
noun/səˈliːniəm/
/səˈliːniəm/
[uncountable] (symbol Se)
- 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’.
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