Cinchonidine \Cin*chon"i*dine\, n. [From {Cinchona}.] (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}.
[1913 Webster]