a. [ From Columbium. ] (Chem.) Pertaining to, or containing, columbium or niobium; niobic. [ 1913 Webster ]
Columbic acid (Chem.), a weak acid derived from columbic or niobic oxide, Nb2O5; -- called also niobic acid. [ 1913 Webster ]
a. [ From Columbo. ] Pertaining to, or derived from, the columbo root. [ 1913 Webster ]
Columbic acid (Chem.), an organic acid extracted from the columbo root as a bitter, yellow, amorphous substance. [ 1913 Webster ]