Columbium
Pronunciation : Co*lum"bi*um
Part of Speech : n.
Etymology : [NL., fr. Columbia America.] (Chem.)
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913