columbium
n. (வேதி.) அணு எண் 41 கொண்ட உலோகத் தனிமப்பொருள்.
Co*lum"bi*um, n. Etym: [NL., fr. Columbia America.] (Chem.) Defn: A rare element of the vanadium group, first found in a variety of the mineral columbite occurring in Connecticut, probably at Haddam. Atomic weight 94.2. Symbol Cb or Nb. Now more commonly called niobium.