columbic

from The Century Dictionary.

• Pertaining to or obtained from columbium.
• Existing in or derived from columbo-root: as, columbic acid.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Pertaining to, or derived from, the columbo root.
• adjective (Chem.) an organic acid extracted from the columbo root as a bitter, yellow, amorphous substance.
• adjective (Chem.) Pertaining to, or containing, columbium or niobium; niobic.
• adjective (Chem.) a weak acid derived from columbic or niobic oxide, Nb2O5; -- called also niobic acid.