noun Download 🔗Share A nonmetallic chemical element (symbol Se) with an atomic number of 34, used mainly in glassmaking and pigments and as a semiconductor. Examples : "The factory uses selenium in the process of making red-colored glass. " element substance material chemistry science Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A single atom of this element. Examples : "The scientist identified a single selenium atom using a powerful microscope. " element chemistry material substance science Chat with AIVocabulary GamePractice Reading