columbium Meaning, Definition & Usage

  1. noun a former name for niobium

WordNet

Co*lum"bi*um noun
Etymology
NL., fr. Columbia America.
Definitions
  1. (Chem.) 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.

Webster 1913