\Co*lum"bic\, a. [From {Columbium}.] (Chem.)
Pertaining to, or containing, columbium or niobium; niobic.
{Columbic acid} (Chem.), a weak acid derived from columbic or
   niobic oxide, {Nb2O5}; -- called also {niobic acid}.

\Co*lum"bic\, a. [From {Columbo}.]
Pertaining to, or derived from, the columbo root.
{Columbic acid} (Chem.), an organic acid extracted from the
   columbo root as a bitter, yellow, amorphous substance.