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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.