cinchonidine

from The Century Dictionary.

• noun An alkaloid of cinchona bark, especially abundant in the red bark, and isomeric with cinchonine.

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

• noun (Chem.) One of the quinine group of alkaloids, found especially in red cinchona bark. It is a white crystalline substance, C19H22N2O, with a bitter taste and qualities similar to, but weaker than, quinine; -- sometimes called also cinchonidia.

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

• noun organic chemistry A stereoisomer and pseudoenantiomer of cinchonine, used in asymmetric synthesis.