Niobium

Definitions

1. A chemical element (symbol Nb) with an atomic number of 41: a light grey, crystalline, ductile transition metal used in superconducting materials.
   countable, uncountable
2. A single atom of this element.
   countable

Equivalents

Examples

“One should use⟳ hypoallergenic jewelry made of surgical grade stainless steel, titanium, 14- or 18-karat gold, or niobium, especially for initial piercings.”

CEFR level