As a proper noun cinchona
As a noun quinoidine is
(chemistry|dated) a brownish resinous substance obtained as a by-product in the treatment of cinchona bark.
* chinchona, chincona
Any of several South American trees, of the genus Cinchona , cultivated for its medicinal bark.
* 2001': German chemists were the first to isolate pure drug chemicals from herbal medicines, with the isolation of morphine from crude opium in 1803 and quinine from the bark of the '''cinchona tree in 1820. — Leslie Iversen, ''Drugs: A Very Short Introduction (Oxford 2001, p. 8)
The bark of these trees, that yields quinine alkaloids used to treat malaria.
(chemistry, dated) A brownish resinous substance obtained as a by-product in the treatment of cinchona bark.