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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Many also contain other naturally occurring nutrients such as magnesium, selenium and some B vitamins that support metabolism and heart health.
—
Daryl Austin, USA Today, 6 Feb. 2026
Packed with vitamin D, B12 and omega-3 fatty acids, as well as essential minerals including iodine, selenium, iron, calcium, and potassium, the oily fish is suddenly being feted as the secret to glowy skin.
—Ranyechi Udemezue, Vogue, 6 Feb. 2026
Salmon also provides high-quality protein and nutrients like potassium, vitamin B12, and selenium, all of which support cardiovascular health.
—Jillian Kubala, Health, 30 Jan. 2026
Remember that high amounts of selenium (above 400 mcg a day) can cause toxicity.
—Megan Nunn, Verywell Health, 28 Jan. 2026
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Daryl Austin, USA Today, 6 Feb. 2026
Packed with vitamin D, B12 and omega-3 fatty acids, as well as essential minerals including iodine, selenium, iron, calcium, and potassium, the oily fish is suddenly being feted as the secret to glowy skin.
—Ranyechi Udemezue, Vogue, 6 Feb. 2026
Salmon also provides high-quality protein and nutrients like potassium, vitamin B12, and selenium, all of which support cardiovascular health.
—Jillian Kubala, Health, 30 Jan. 2026
Remember that high amounts of selenium (above 400 mcg a day) can cause toxicity.
—Megan Nunn, Verywell Health, 28 Jan. 2026
See All Example Sentences for selenium
Cite this Entry
“Selenium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/selenium. Accessed 15 Feb. 2026.
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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