1 文書を見つけるための辞書。

• se, selenium, atomic number 34
• セレン
• 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)
• 硫黄およびテルルに伴って得られる有毒の非金属元素