niobi
niobi, niobium
columbium
A chemical element (''symbol'' Nb) with an number of 41: a light grey, crystalline, ductile metal used in superconducting materials.
A single atom of this element.
(l)
niobium (element)
(l) (gloss) (defdate)
niobium
A part of niobium
niobium (gloss)