What is "selenium" in English? Definition and Explanations

Meaning of "selenium": a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)

Noun

Hyphenation: se‧le‧ni‧um