Definition of selenium in English:

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Pronunciation: /səˈlēnēəm/


The chemical element of atomic number 34, a gray crystalline nonmetal with semiconducting properties. (Symbol: Se)
Example sentences
  • The Pasminco operation produces lead, zinc, cadmium, selenium, copper sulphate and sulphuric acid.
  • Many studies have shown that supplemental selenium has cancer-preventive properties.
  • Lead, selenium, tellurium and sulfur are added to copper alloys to improve machinability.



Pronunciation: /ˈseləˌnīd/ Pronunciation: /-nid/
Example sentences
  • They are made from materials such as calcium fluoride, sapphire, AMTIR, silicon, zinc selenide, and germanium.
  • They separately synthesized rod-shaped nanometre scale crystal of two semi-conductors: cadmium selenide and cadmium telluride.
  • It also combines with a number of metals to form compounds known as selenides as, for example, magnesium selenide (MgSe).


Early 19th century: modern Latin, from Greek selēnē 'moon'.

Words that rhyme with selenium

helenium, proscenium, rhenium, ruthenium

For editors and proofreaders

Syllabification: se·le·ni·um

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