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selenium
noun
se·le·ni·um sə-ˈlē-nē-əm 
: 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
Example Sentences
Recent Examples on the Web The reactions at the selenium electrode appeared to start in the molten salt before finishing up on the electrode surface. 
John Timmer, Ars Technica, 24 Aug. 2022 Unlike some of the others on this list, this maximum-strength dandruff shampoo uses the antifungal selenium sulfide as its anti-dandruff ingredient. Anthea Levi, Health.com, 24 Sep. 2021 Saute frozen spinach or blend it into a smoothie for C, E, and selenium. Melanie Curry, Men's Health, 15 Aug. 2022 As a result, the topsoil contained elevated levels of uranium and selenium. Mark Olalde, ProPublica, 8 Aug. 2022 These include calcium, magnesium, vitamin E, vitamin D, several B vitamins, vitamin A, vitamin K, potassium, iodine, selenium, borate, zinc, manganese, molybdenum, beta-carotene, and iron. Allure, 25 Apr. 2022 Many are already winding up in landfills, where components that contain toxic heavy metals such as selenium and cadmium can contaminate groundwater. Rachel Kisela, Los Angeles Times, 14 July 2022 The review examined the impacts of popular supplements like beta carotene, folic acid, calcium, magnesium, selenium and zinc, as well as multivitamins and vitamins A, B, C, D and E. Aria Bendix, NBC News, 21 June 2022 The range was pretty high, from less than a year for gallium and selenium to nearly 200 years for gold. John Timmer, Ars Technica, 20 May 2022 See More
John Timmer, Ars Technica, 24 Aug. 2022 Unlike some of the others on this list, this maximum-strength dandruff shampoo uses the antifungal selenium sulfide as its anti-dandruff ingredient. Anthea Levi, Health.com, 24 Sep. 2021 Saute frozen spinach or blend it into a smoothie for C, E, and selenium. Melanie Curry, Men's Health, 15 Aug. 2022 As a result, the topsoil contained elevated levels of uranium and selenium. Mark Olalde, ProPublica, 8 Aug. 2022 These include calcium, magnesium, vitamin E, vitamin D, several B vitamins, vitamin A, vitamin K, potassium, iodine, selenium, borate, zinc, manganese, molybdenum, beta-carotene, and iron. Allure, 25 Apr. 2022 Many are already winding up in landfills, where components that contain toxic heavy metals such as selenium and cadmium can contaminate groundwater. Rachel Kisela, Los Angeles Times, 14 July 2022 The review examined the impacts of popular supplements like beta carotene, folic acid, calcium, magnesium, selenium and zinc, as well as multivitamins and vitamins A, B, C, D and E. Aria Bendix, NBC News, 21 June 2022 The range was pretty high, from less than a year for gallium and selenium to nearly 200 years for gold. John Timmer, Ars Technica, 20 May 2022 See More Word History
Etymology
New Latin, from Greek selēnē moon, from selas brightness
First Known Use
1818, in the meaning defined above
Time Traveler
The first known use of selenium was in 1818 Phrases Containing selenium
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