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
Examples of selenium in a Sentence
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Beyond your typical supplements, Revive Collagen is a liquid collagen drink supplement, which helps with marine collagen to help skin, hair nails and joints with reishi mushroom, folic acid, selenium and vitamins.
—
Nadja Sayej, Forbes.com, 11 July 2025
Excess vitamin A and selenium can cause hair loss.18 Biotin (vitamin B7), which is another ingredient commonly found in hair supplements, can interfere with certain lab tests.
—Jessica Swirble, Verywell Health, 10 July 2025
In addition to being delicious, oysters provide a number of nutrients, including protein, omega-3 fats, B12, selenium, zinc, and copper.
—Jillian Kubala, Health, 8 July 2025
Millions of tons of coal ash are buried in Colorado, and at least three sites have been documented as leaking lithium and selenium into groundwater.
—Noelle Phillips, Denver Post, 6 July 2025
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Nadja Sayej, Forbes.com, 11 July 2025
Excess vitamin A and selenium can cause hair loss.18 Biotin (vitamin B7), which is another ingredient commonly found in hair supplements, can interfere with certain lab tests.
—Jessica Swirble, Verywell Health, 10 July 2025
In addition to being delicious, oysters provide a number of nutrients, including protein, omega-3 fats, B12, selenium, zinc, and copper.
—Jillian Kubala, Health, 8 July 2025
Millions of tons of coal ash are buried in Colorado, and at least three sites have been documented as leaking lithium and selenium into groundwater.
—Noelle Phillips, Denver Post, 6 July 2025
See All Example Sentences for selenium
Cite this Entry
“Selenium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/selenium. Accessed 21 Jul. 2025.
Copy CitationKids Definition
selenium
noun
se·le·ni·um
sə-ˈlē-nē-əm
: an element that is sensitive to light and is used especially in glass, alloys, and electronic devices see element
Medical Definition
selenium
noun
se·le·ni·um
sə-ˈlē-nē-əm
: 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
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