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
Recent Examples on the Web
Garlic offers more vitamin and minerals, including more vitamin C and selenium.
—
Heather Jones,
Verywell Health,
4 July 2026
Like other fatty fish, salmon is rich in protein, omega-3 fatty acids, vitamin B12, and selenium, among other nutrients.
—
Mark Gurarie,
Health,
25 June 2026
Wild salmon, for example, contains proteins, vitamins A, D and B-12, and critical minerals such as selenium and potassium — as well as high-quality omega-3s.
—
Sandee Lamotte,
CNN Money,
18 June 2026
Sardines, however, provide significantly higher levels of nutrients per serving, among them omega-3 fatty acids, selenium, vitamin B12, plus calcium if eating bone-in options (totally safe to eat, as the canning process softens them to the texture of very al dente pasta).
—
Rebecca Firkser,
Bon Appetit Magazine,
11 June 2026
See All Example Sentences for selenium
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Heather Jones,
Verywell Health,
4 July 2026
Like other fatty fish, salmon is rich in protein, omega-3 fatty acids, vitamin B12, and selenium, among other nutrients.
—
Mark Gurarie,
Health,
25 June 2026
Wild salmon, for example, contains proteins, vitamins A, D and B-12, and critical minerals such as selenium and potassium — as well as high-quality omega-3s.
—
Sandee Lamotte,
CNN Money,
18 June 2026
Sardines, however, provide significantly higher levels of nutrients per serving, among them omega-3 fatty acids, selenium, vitamin B12, plus calcium if eating bone-in options (totally safe to eat, as the canning process softens them to the texture of very al dente pasta).
—
Rebecca Firkser,
Bon Appetit Magazine,
11 June 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 5 Jul. 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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