Columbium

[kә'lʌmbiәm]

Definition

(noun.) a former name for niobium.

Edited by Jeffrey--From WordNet

Definition

(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.

Edited by Janet