se·​le·​ni·​um | \ sə-ˈlē-nē-əm How to pronounce selenium (audio) \

Definition of selenium

: a photosensitive element that occurs in both crystalline and amorphous forms, is obtained chiefly as a by-product in copper refining, and is used especially in glass, semiconductor devices, and alloys — see Chemical Elements Table

Examples of selenium in a Sentence

Recent Examples on the Web Naturally occurring minerals like copper, iron, and selenium work to reduce hyperpigmentation and neutralize free radical damage. Joseph Deacetis, Forbes, 5 July 2021 The researchers touted salmon as delivering some of the highest doses of omega-3s along with protein, selenium, B-12 and vitamin D. Anchorage Daily News, 21 June 2021 Potassium, phosphorus, zinc and selenium are other helpful nutrients in dark chocolate. Laura Wheatman Hill,, 17 Apr. 2021 Brazil nuts are a standout for their selenium content, a nutrient with many roles and antioxidant properties including protecting the body from oxidative damage and infection. Ethan Millman, Rolling Stone, 4 June 2021 Low selenium levels have been linked to Hashimoto's disease, a condition of hypothyroidism. Ana Sanchez,, 12 Dec. 2020 Depending on the kind of technology used, a solar module typically requires materials such as glass, silicon, copper, silver, aluminium, cadmium, tellurium, indium, gallium and selenium. Mayank Aggarwal, Quartz, 26 May 2021 Will Peckham wax poetic about their selenium content and potential as a cheap source of protein. Hannah Walhout, Travel + Leisure, 17 Apr. 2021 Oats are also bundled with a variety of vitamins and minerals, including iron, magnesium, zinc, selenium, B vitamins, and smaller amounts of calcium and potassium. Cynthia Sass, Rd,, 20 Apr. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'selenium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of selenium

1818, in the meaning defined above

History and Etymology for selenium

New Latin, from Greek selēnē moon, from selas brightness

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Time Traveler for selenium

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The first known use of selenium was in 1818

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Statistics for selenium

Last Updated

8 Jul 2021

Cite this Entry

“Selenium.” Dictionary, Merriam-Webster, Accessed 25 Jul. 2021.

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More Definitions for selenium



English Language Learners Definition of selenium

technical : a chemical element that is used in electronic devices to make them sensitive to light


se·​le·​ni·​um | \ sə-ˈlē-nē-əm How to pronounce selenium (audio) \

Kids Definition of selenium

: a gray powdery chemical element used chiefly in electronic devices


se·​le·​ni·​um | \ sə-ˈlē-nē-əm How to pronounce selenium (audio) \

Medical Definition of selenium

: a nonmetallic photosensitive element that occurs in both crystalline and amorphous forms, is an essential trace element found especially in grains and meat, and is used chiefly in glass, semiconductor devices, and alloys symbol Se — see Chemical Elements Table, selenosis

More from Merriam-Webster on selenium

Nglish: Translation of selenium for Spanish Speakers Encyclopedia article about selenium


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