Simple Definition of selenium

from our Learner's Dictionary

selenium

noun

səˈliːnijəm How to pronounce selenium (audio)
technical : a chemical element that is used in electronic devices to make them sensitive to light

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“Selenium.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/selenium. Accessed 16 Jun. 2026.

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