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

Nutrition varies depending on ingredients used, but most sourdough provides a good source of several vitamins and minerals, including B vitamins and selenium. —Jillian Kubala, Health, 28 Jan. 2025

Editor tip: The high concentration of selenium boosts the skin barrier with natural antioxidants. —Christa Joanna Lee, Allure, 19 Jan. 2025

People with selenium deficiency can develop thyroid conditions like hypothyroidism, Graves' disease, and Hashimoto's disease.5 The RDA of selenium for adults is 55 mcg. —Jamie Johnson, Verywell Health, 17 Jan. 2025

The health benefits of Brazil nuts Brazil nuts are very high in selenium, a trace mineral which some studies show regulates metabolism and may help maintain a healthy weight by helping to burn fat, increase lean muscle mass, and improve blood sugar levels. —Alessandra Signorelli, Vogue, 24 Sep. 2024

Word History

Etymology

New Latin, from Greek selēnē moon, from selas brightness

First Known Use

1818, in the meaning defined above

Phrases Containing selenium

• selenium cell

Kids 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