Found 2 items, similar to columbium.
English → English (WordNet) Definition: columbium columbium n : a former name for niobium
English → English (gcide) Definition: columbium niobium \ni*o"bi*um\, n. [NL., fr. L. & E. Niobe.] (Chem.) The chemical element of atomic number 41. Chemical symbol Nb. Atomic weight 92.91. Previously called columbium. See also Columbium. [1913 Webster]