Nb, n.
a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
<noun.substance>
Nb atomic number 41 niobium
semantic pointers
hypernym
substance holonym
hyponym
Word
a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
<noun.substance>
Nb atomic number 41 niobium