Selenium

Definitions

1. A nonmetallic chemical element (symbol Se) with an atomic number of 34, used mainly in glassmaking and pigments and as a semiconductor.
   uncountable, usually
2. A single atom of this element.
   uncountable, usually

Equivalents

Examples

“Pluck almost any cell from your body and it will have⟳ a million or more selenium atoms in it.”

CEFR level