The AI-powered English dictionary
usually uncountable, plural seleniums
A nonmetallic chemical element (symbol Se) with an atomic number of 34, used mainly in glassmaking and pigments and as a semiconductor. quotations examples
Pluck almost any cell from your body and it will have a million or more selenium atoms in it.
2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), page 4
A single atom of this element. examples