columbin

from The Century Dictionary.

• noun A colorless, crystalline, bitter principle, C₂₁ H₂₂O₇, contained in African columbo-root, Jateorhiza palmata.
• noun A non-conducting material placed between the parallel carbons of the electric candle.

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

• noun (Chem.) A white, crystalline, bitter substance. See calumbin.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry A white, crystalline, bitter substance.