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adj. (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.

 - adj. 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.

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