- a brownish-black, resinous substance consisting of a mixture of alkaloids, obtained as a by-product in the manufacture of quinine and formerly used as a cheap substitute for it.
Origin of quinoidine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for quinoidine
From such liquors it is precipitated in an impure state by an alkali, and brought into commerce under the name of quinoidine.
The quinoidine of commerce ought never to be used in medicine unless purified.
Dr de Vrij, for instance, found sometimes more than 20% of quinidine in some samples of quinoidine of commerce.
- A brownish-black mixture of alkaloids remaining after extraction of crystalline alkaloids from cinchona bark, used as a quinine substitute.