Source : Webster's Revised Unabridged Dictionary (1913)

Columbic \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}.