columbium

Here is the meaning of the word, columbium

This word is in the TWL06 Dictionary ₁₇
This word is in the SOWPODS Dictionary ₁₇

Columbium(n.) 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.